You have a coil of wire with 20 turns each of 1.5 cm radius. You place the plane

Question

You have a coil of wire with 20 turns each of 1.5 cm radius. You place the plane of the coil perpendicular to a 0.42-TB? field produced by the poles of an electromagnet as shown in the figure (Figure 1) .

Part A

Find the magnitude of the average induced emf in the coil when the magnet is turned off and the field decreases to 0 T in 2.1s .

Express your answer to two significant figures and include the appropriate units.

?in =

Part B

Is the direction of the induced current in the galvanometer from lead a to b, or from b to a?

Explanation / Answer

Part A

e=-d(nBA)/dt=- nA(0-0.42)/2.1 = 0.2*nA V = 0.2*20*pi*0.0152 = 2.82*10-3 V

Part B

b to a (neglecting part A)

a to b(considering part A)

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