13

A charge  has a mass is traveling with a velocity

, when it enters a uniform magnetic field .  What is the radius and direction of the circular path the charge follows in the magnetic field?

 

 

A.

C.

 

 

 

 

B.

D.

 

 

Right hand rule gives .  However, negative sign on charge reverses that making .  Which means the charge will go counter-clockwise .  Now solve for R

 

 

 

So Correct Answer is A or C (I messed up)!

14

A circular coil has  turns of wire and a radius of .  At the center of the coil, the magnetic field strength is found to be  and it is directed into the page.  What is the magnitude and direction of the current required in the coil to create this magnetic field directed into the paper?

 

A.

C.

 

 

 

 

B.

D.

 

Direction for B is by right hand rule.  For B to be into paper, current must go Clockwise.  Solve for i

 

 

 

So the Correct Answer is C !

15

A metal bar  long is moving to the left at .  There is an applied magnetic field directed into the paper as shown with a field strength of .  The light bulb is a standard incandescent bulb with an operating resistance of .  A current  is induced in the circuit and flows clockwise.  What is the magnitude and direction of the magnetic force that acts on this current in the metal bar?

 

A.

C.

 

 

 

 

B.

D.

 

 

In the metal bar current is going down, and the B field is into the paper, so the right hand rule for .  Solving for the force

 

 

So Correct answer is A !

16

A solenoid is  long and has a diameter of .  It has a current of  running through its wires and produces a magnetic field with a strength of 4.56 T inside of it.  How many turns per unit length does the solenoid have?

 

A.

C.

 

 

 

 

B.

D.

 

Solve for n

 

 

 

So Correct Answer is A !

 

 

 

Please send any comments or questions about this page to ddonovan@nmu.edu

This page last updated on October 16, 2020