right hand rule MCAT

What Should You Know About The Right Hand Rule MCAT?

Right hand rule MCAT is the thing you should deeply understand before the process of taking this test. Follow this article to find out beneficial information.

June 18, 2022

Right-hand rule MCAT is one of the most important parts of the MCAT exam. Successfully passing this exam portion will help you maximize the possibility of acing this test. In this article, we will provide you with beneficial information about this segment, as well as several considerations for it.

Right-hand rule

The right-hand rule is used by scientists as a mnemonic to help them remember which way permanent magnets should be oriented. To memorize the mnemonic, make an L shape with your thumb and the first middle finger of your right hand and hold it there. Finally, put your middle finger at a 45-degree angle to your index and middle fingers as the last step.

right hand rule MCAT

The right-hand rule is a shortcut for remembering which direction things should be pointing in the presence of magnetic fields and the pressures they impose on moving electric charges, according to the basic rules of physics governing magnetic fields and the forces that they exert on moving charges. Despite the fact that it is not rare for scientists to mistakenly utilize their left hand, it is conceivable for them to anticipate magnetic force in the opposite direction from what it really is!

Moving charges

When charged particles are fixed, magnetic fields have no influence on them; nevertheless, when charged particles begin to move, the magnetization exerts a force on them. The lines, on the other hand, are not aligned with the direction of the field’s force on the charged particles. Rather, it seems to be as follows:

right hand rule MCAT

The right-hand rule may be useful in recalling the contents of this figure. With your pointer finger pointed in any direction except the direction of the magnetic field, you will hold a pen in your hand with your thumb pointing in the direction of the magnetic force pushing on any positive charge passing through the pen. Because electrons have a force that points in the opposite direction of your thumb, you cannot manipulate them with your thumb.

Current in a wire

Conventional current refers to the flow of positive charges in a wire, and this is what we mean when we say “conventional current” in the context of electricity. A magnetic field may have the same impact on wires as it does on a single moving charge, but it is important to remember that current is nothing more than a stream of moving charges flowing in the same direction.

right hand rule MCAT

It is possible to tell which direction a wire is moving in a similar manner to how we used the right-hand rule to discover which way a device was charging and discharging. We may use the pointer, middle, and thumb of our right hands to determine which way a wire is going. In the standard x, y, and zx coordinate systems, the thumb points in the positive xxx direction, the first finger points in the positive yyy direction, and the middle finger points in the positive zzz direction, all in accordance with the right-hand rule.

A magnetic field generated by a current in a wire

The movement of charges is influenced by magnetic fields, but magnetic fields may also be used to cause the movement of charges. With the help of the second right-hand rule, we can determine the magnetic field produced by moving charges, as well as the associated electric current. Figure 1 is an illustration of how the magnetic field is formed by a current spiral around a straight wire. By curling your fingers and pointing your right thumb in the direction of the current, you may determine how much current is flowing through the wire. It will be forced to bend your fingers in the same way as the wire was bent by the magnetic field that surrounds the wire.

right hand rule MCAT

Alternatively, if you already know which way the magnetic field is pointing, you may use the inverse of this process to discover which direction the current is flowing through the wire. Curl your index and middle fingers around your index and middle fingers once again while pointing your thumb in the direction of the magnetic field once more. Using the circular motion of your fingers, you may be able to establish the direction of the current that caused the magnetic field to be generated in the first place this time.

right hand rule MCAT

When electricity is sent through a coil of wire, which acts as the conductor for an electromagnet, magnetic fields are produced as a consequence of the current passing through the coil. As a result of its long axis, it produces magnetic field lines that all point in the same direction as the rotational axis. In the case of coiling right-hand principles, circular magnetic fields and straight lines of current are produced as a result, and they may be distinguished by the following characteristics: With the help of the right-hand rule, it is possible to study both cases in the same amount of time.

Current-induced magnetic force

Moving charges in a normal current are all positive, which indicates that the current is moving. When a conventional current travels over a conducting wire, electromagnetism pulls the wire in the opposite direction. In order to determine the direction of the force acting on the current-carrying wire, it is possible to use the right-hand rule. Here, the magnetic field direction is represented by your fingers and thumb; the conventional current flow is represented by your thumb, and the wire path is represented by the palm of your hand (force).

According to the definition of current flow as the movement of positive charge carriers, the conventional current is traveling up the page in the above illustration (conventional current). It is also possible to portray the same current-carrying wire as having a current with negative charge carriers moving down the page, in the same way, that a conventional current is made up of positive charges. Despite the fact that the currents are moving in opposite directions, a single magnetic force is identified to be operating on the wire.

Consequently, the force produced by the flow of positive or negative charge carriers in the preceding image is the same as in the previous figure. Whenever the right-hand rule is applied to a conventional current direction, it causes the magnetic force to be orientated toward the right. As a consequence of using the right-hand rule, the flow of negative charge carriers implies that magnetic force is directed to the left; nevertheless, the negative sign reverses the conclusion, implying that magnetic force is directed to the right.

Because we are dealing with two separate physical situations, flowing charges in two unique lines, one with positive charges and the other with negative charges, will not create the same magnetic forces. First, positive charges are traveling up the page, implying that negative charges are moving down the page, and vice versa.

When we use the right-hand rule, we may be certain that the magnetic force will point in the appropriate direction. Because the negative charges are traveling up the wire, the positive charges in the second wire are flowing down the page in the first wire. As a result, according to the right-hand rule, the magnetic force is moving to the left.

Right-hand rule for torque

Torque problems are usually the hardest for first-year physics students to understand. In the lucky case of the right-hand rule, torque may also be employed in this manner. When dealing with torque problems, a good rule of thumb is to point your right hand towards the direction of the vector field (r or d), then rotate your fingers and thumb to face the force.

Right-hand rule for a cross product

A cross product, also known as the product of a vector, is produced by performing an ordered operation on two vectors, a and b. When you take the cross product of two vectors, you will find that the cross product is orthogonal to both of the original vectors. Given the fact that there are two possible pathways for a cross-product vector, it is required to use the right-hand rule. When working with cross objects, make sure your fingers and thumbs are at proper angles. In the illustration below, point your pointer finger at vector a, and your middle finger toward vector b: Axb vector product will be shown by your right index finger on your right thumb (vector c).

Right-hand rule for Lenz’s principle

Lenz’s Law is governed by the right-hand rule. To summarize, when the magnetic field in a closed conducting loop changes, the direction of the induced current is such that the second magnetic flux created by the induced voltage opposes the initial change in the magnetic field that produced it, as stated by Lenz’s law. What does this entail in concrete terms? Let’s have a look at this.

When the magnetic flux across a closed-loop conductor changes, a current is generated. Because of the presence of this second magnetic field, the induced current acts in opposition to the original shift in flux that caused it. It is governed by the strength of the magnetosphere going through a wire coil that the magnetic flux is generated. This equation illustrates how the strength of a magnetic field, the size of a coil, as well as the orientation of the coil in relation to the field, all influence magnetic flux in a circuit.

It is necessary to first determine if the initial magnetic strength is increasing or decreasing in order to realize how Lenz’s Principle may affect this system; otherwise, we will not understand how Lenz’s Principle might affect this system. It is the closeness of the magnetic north pole to the Earth’s magnetic field that causes an increase in the existing magnetic field. Consequently, the induced current and associated magnetic field will diminish the magnetic field created by the original magnetic field in order to counterbalance this rise.

A consequence of this is that the primary and secondary magnetic fields will travel in opposite directions of one another. Whenever the present magnetic flux diminishes, the induced current and magnetic field that it creates counteract the weakening by boosting the current and magnetic field. A magnetic field created by this process will be aligned with the magnetic field induced by the initial magnetic field.

Before using the right-hand rule to Lenz’s Law, you must first determine whether the magnetic field is increasing or decreasing in strength. It has already been noted that the magnetic field lines created by magnets migrate from the geomagnetic pole towards the interior of Earth. if the magnetic flux is increasing, the strong magnetic component of the magnetic field will move in the opposite direction of the magnetic field direction.

A decrease in the magnetic field in the loop will result in an increase in the produced magnetic field component in the same direction as the drop in the magnetic field. Then, using the variations in the magnetic field’s induction, curl your fingers and you’re finished! When the induced current strikes your fingers, they will point in the same direction as the induced current.

Consider the following questions before you answer: an MRI uses a magnetic field

The patient must be placed in a very stable magnetic field in order to do an MRI, which is used to align the individual protons of water molecules in order to picture the patient’s whole body. The density and structure of distinct biological components are mapped using a very little change in the field’s alignment, which is the first step in the measurement procedure for that component.

A very strong magnetic field is required for fundamental magnetic resonance imaging (MRI) just in one direction: along the axis of an object. Magnetic resonance imaging (MRI) is used to diagnose and treat patients. A big magnetic coil around the patient’s body, while the patient is getting treatment, maybe conceivable with the device if it is designed correctly. According to the right-hand rule, a current that flows in a spiral around the patient’s body generates a magnetic field that points straight down the patient’s spine.

right hand rule MCAT

Above is all information associated with the right hand rule MCAT. We hope this article can be beneficial for your process of acing this test.

Don’t forget to take our free MCAT practice test at Medtutor to get familiarized with the format as well as the questions of the actual exam to strengthen your knowledge and skills, as a result, enhancing your chance to pass the MCAT exam with a high score on your first attempt. Good luck to you!