A circular loop in the plane of the paper lies in a 0.75 Tmagnetic field pointin

Question

A circular loop in the plane of the paper lies in a 0.75 Tmagnetic field pointing into the paper. If the loop's diameterchanges from 20.0 cm to 6.0 cm in 0.50 seconds: (a) What is the direction of the induced current? (b) What is the magnitude of the average induced emf? (c)What is the average induced current? A circular loop in the plane of the paper lies in a 0.75 Tmagnetic field pointing into the paper. If the loop's diameterchanges from 20.0 cm to 6.0 cm in 0.50 seconds: (a) What is the direction of the induced current? (b) What is the magnitude of the average induced emf? (c)What is the average induced current?

Explanation / Answer

Where is the 4 coming from? I understand that it is themagnetic field multiplied to the difference in area. So wouldn't itbe B(r12-r22) /t?

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