MCAT Physical help » Physics » Electricity and also Magnetism » Magnetism and also Electromagnetism » Magnetic fields

Which of the adhering to influences the emf created in a wire loop that is rotating in a magnetic field?


Explanation:

Recall that 

*
, where 
*
. The shape, material characteristics, and also resistance do not appear in this equation. So just the dimension (area) the the loop influences the emf.

You are watching: Which of the following best describes magnetic field lines?


Explanation:

First, magnetic field lines, like electric field lines, can never cross. Also, unlike electrical field lines, magnetic field lines room 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. For this reason the only remaining selection is that magnetic ar lines show both the relative strength and direction of the field.


A

*
 current-carrying cable is put in a uniform magnetic ar oriented perpendicularly come the wire. The length of the cable is 
*
 and the magnitude of the magnetic ar is 
*
. What is the pressure on the wire?


*



*


*


Correct answer:


Explanation:

We use the formula for pressure on a cable in a magnetic field:

*

Where

*
 = force,
*
 = current,
*
 = length of wire, and
*
 = magnetic mield

*


A scientist builds a bit accelerator. Which of the following would not assist the scientist rise the rate of a fragment in the accelerator?


Explanation:

A charged particle in a bit accelerator moves in uniform circular motion. The equation because that centripetal pressure caused by uniform circular motion is:

*

The equation because that magnetic pressure is:

*

Set the equations same to every other, and also solve for velocity.

*

*

The only answer selection that does not correspond to an increase in velocity is boosting the fixed of the particles in the accelerator.

See more: How To Reduce (Simplify) The Common Fraction 13 5 As A Mixed Number ?


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