To measure a magnetic field produced by an electromagnet, you use a circular coi

Question

To measure a magnetic field produced by an electromagnet, you use a circular coil of radius 0.20m with 25 loops (resistance of 25 ?) that rests between the poles of the magnet and is connected to an ammeter. While the current in the electromagnet is reduced to zero in 2.0s , the ammeter in the coil shows a steady reading

170mA .

Part A

Select a picture of the experimental setup.

Part B

Determine the induced emf in the coil.

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

?in =

Part C

Determine the magnitude of the change of magnetic field.

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

?B =

Explanation / Answer

Picture B

Induced emff = 0.17*25 = Current * resistance = 4.25 V

Magnetic field = dK/dt = 4.25

=>K = B*A; A = pi*r^2 = 0.125

So db = 4.25*2/0.125 = 68 T

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