-0.83 points SerEssen1 20.P014 My Notes A circular coil enclosing an area of 104

Question

-0.83 points SerEssen1 20.P014 My Notes A circular coil enclosing an area of 104 cm2 is made of 198 turns of copper wire. The wire making up the coil has resistance of 3.0%, and the ends of the wire are connected to form a closed circuit. Initially, a 1.5 T uniform magnetic field points perpendicularly upward through the plane of the coil The direction of the field then reverses so that the final magnetic field has a magnitude of 1.5 T and points downward through the coil. If the time required for the field to reverse directions is 0.15 s, what average current flows through the coil during that time?

Explanation / Answer

Calculate the emf induced in the coil .

Emf = -Nd?/dt

? = B.A.cos?

emf = -198"104*10^-4*(1.5 - (-1.5))/0.15

emf = 41.48 V

current = 41.48/3

= 13.72 A

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