Question

A time-varying magnetic field is perpendicular to the plane of a
circular loop of diameter 10 cm made with wire of diameter 3.4 mm
and resistivity 2.07 × 10-8?·m.

The magnetic field increases as a function of time, with magnitude
B = (0.79 t) T/s

a) What is the magnitude of the emf induced in the loop?

b) What is the value of the current through the loop?

c) At what rate does energy appear as thermal energy in the loop?

d) If the magnetic field is constant in time, with magnitude B = 0.79 T, and the radius of the loop of the wire decreases at a rate of 0.2 cm / s, what is the magnitude of the induced emf?

Answer #1

A 26.8 cm-diameter loop of wire is initially oriented
perpendicular to a 1.6 T magnetic field. The loop is rotated so
that its plane is parallel to the field direction in 0.22 s .
What is the magnitude of the average induced emf in the
loop?
Express your answer using two significant figures.
Eavg=
V

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