Author Question: A circular coil of radius r = 5 cm and resistance R = 0.2 is placed in a uniform magnetic field ... (Read 64 times)

karen · **on:** Jul 29, 2018

A circular coil of radius r = 5 cm and resistance R = 0.2 is placed in a uniform magnetic field perpendicular to the plane of the coil. The magnitude of the field changes with time according to B = 0.5 e-0.2t T.

What is the magnitude of the current induced in the coil at the time t = 2 s?
A)

1.3 mA
B)

9.2 mA
C)

7.5 mA
D)

4.2 mA
E)

2.6 mA

Question 2

A square coil of wire with 15 turns and an area of 0.40 m2 is placed parallel to a magnetic field of 0.75 T. The coil is flipped so its plane is perpendicular to the magnetic field in 0.050 s.

What is the magnitude of the average induced emf?
A)

6.0 V
B)

12 V
C)

36 V
D)

45 V
E)

90 V