Look at the photograph of the coil in the set-up section before procedure 1: cur

Question

Look at the photograph of the coil in the set-up section before procedure 1: current-carrying wires are wrapped around the square solenoid of side a, length L, and n turns per meter. Assume the current runs clockwise when you are looking down on the coil.

a) As shown in the photograph: at the geometric center of the cavity inside the solenoid: the magnetic field

points away from you, into the page

is approximately zero    

points to the right

points downward

points to the left

points upward

points toward you, out of the page

b) Suppose we put current I through the coil, and the magnetic field at the center of the cavity is B. If we now double three quantities: a (the length of each side), n (the number of turns per meter) and L (the length of the coil), the new magnetic field at the center of the cavity will be

B/3

B    

B/2

2B

B/4

3B

4B

NOTE: In MKS units: T is Tesla, A is amperes, V is volts.
c) Using an equation for magnetic field: the units of ?o can be expressed as

A/T-s

T-s/V    

T-A/V

A-m/T

T-s/m

T-s/A

A/T-m

T-A/m

T-m/s

T-m/A

Explanation / Answer

Assume the current runs clockwise when we are looking down on the coil.

(a) As shown in the photograph at the geometric center of the cavity inside the solenoid, the direction of magnetic field which is given as :

points toward you, out of the page

(b) The new magnetic field at the center of the cavity will be given as :

B' = 2B

(c) Using an equation for magnetic field, the units of o can be expressed as :

T m / A

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