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 points upward points toward you, out of the page points to the left is approximately zero points downward points to the right 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/2 B/3 3B B/4 4B 2B NOTE: In MKS units: T is Tesla, A is amperes, V is volts c) Using an equation for magnetic field: the units of Ho can be expressed as O T-m/s A/T-s O T-s/m T-m/A A-m/T A/T-m T-A/m T-s/V T-A/V

Explanation / Answer

a)

points away from u into the page

b)

B = u n I

since n is doubled

B is doubled

answer is 2B

c)

T.m/A

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