The magnetic flux through the loop shown in the figure increases according to th

Question

The magnetic flux through the loop shown in the figure increases according to the relation

?B = 3.0 t2 + 9.0 t

where ?B is in milliwebers and t is in seconds.

What is the flux at t = 4.0 s? (in webers = Wb)

What is the magnitude of the emf induced in the loop at t = 4.0 s?

What is the direction of the current, clockwise or counterclockwise?

The magnetic flux through the loop shown in the figure increases according to the relation ?B = 3.0 t2 + 9.0 t where ?B is in milliwebers and t is in seconds. What is the flux at t = 4.0 s? (in webers = Wb) What is the magnitude of the emf induced in the loop at t = 4.0 s? What is the direction of the current, clockwise or counterclockwise?

Explanation / Answer

flux = 3*4^2 + 9*4=84

emf = dflux/dt = 6 t + 9

emf at 4 s = 6*4 + 9 = 33 V

need the figure to know the direction

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