Question

A circular wire loop 39 cm in diameter has resistance 120 Ω and lies in a horizontal plane. A uniform magnetic field points vertically downward, and in 25 ms it increases linearly from 5.0 mT to 55 mT.

Find the magnetic flux through the loop at the beginning. (

Φ1 =

? mWb

)

Find the magnetic flux through the loop at the end of the 25-ms period. Φ2 = ? mWb

What's the loop current during this time?

Express your answer with the appropriate units. (I=?)

Which way does this current flow? Select the correct answer and explanation.

I is clockwise when viewed from above the loop because induced field is upward.

I is clockwise when viewed from above the loop because induced field is downward.

I is counterclockwise when viewed from above the loop because induced field is downward.

I is counterclockwise when viewed from above the loop because induced field is upward.

Answer 1