MCAT Physical : Magnetic Fields
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Example Questions
Example Question #1 : Magnetism And Electromagnetism
Which of the following influences the emf produced in a wire loop that is rotating in a magnetic field?
The shape of the loop
The resistance of the loop
More than one of the other options is correct
The material of which the loop is made
The size of the loop
The size of the loop
Recall that 
Example Question #1 : Magnetic Fields
Which of the following best describes magnetic field lines?
More than one of the other options is correct
They show the direction in which a positive charge will experience a force
They show both the relative strength and direction of the magnetic field
They can only cross when multiple magnets are present
They always begin at a north pole and terminate at a south pole
They show both the relative strength and direction of the magnetic field
First, magnetic field lines, like electric field lines, can never cross. Also, unlike electric field lines, magnetic field lines are continuous—they do not have starting or ending points. Next, the force experienced by a charge in a magnetic field depends on the charge's velocity direction, not just the magnetic field. So the only remaining choice is that magnetic field lines show both the relative strength and direction of the field.
Example Question #1 : Magnetism And Electromagnetism
A 
We use the formula for force on a wire in a magnetic field:
Where 
Example Question #535 : Mcat Physical Sciences
A scientist builds a particle accelerator. Which of the following would not help the scientist increase the speed of a particle in the accelerator?
Increasing the charge of the particles
Increasing the strength of the magnetic field
Increasing the mass of the particles in the accelerator
Increasing the radius that the particles spin around
Decreasing the temperature of the particle accelerator
Increasing the mass of the particles in the accelerator
A charged particle in a particle accelerator moves in uniform circular motion. The equation for centripetal force caused by uniform circular motion is:
The equation for magnetic force is:
Set the equations equal to each other, and solve for velocity.
The only answer choice that does not correspond to an increase in velocity is increasing the mass of the particles in the accelerator.
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