In Figure 21.1, a wire and a 10 ohm resistor are used to form a circuit in the s

Question

In Figure 21.1, a wire and a 10 ohm resistor are used to form a circuit in the shape of a square, 20 cm by 20 cm. A uniform but non-steady magnetic field is directed into the plane of the circuit. The magnitude of the magnetic field is decreased from 2.70 T to 0.90 T in a time interval of 96 ms. The average induced current and its direction through the resistor, in this time interval, are closest to:

A) 110 mA, from a to b

B) 75 mA, from b to a

C) 45 mA, from a to b

D) 75 mA, from a to b

E) 45 mA, from b to a

Explanation / Answer

change in phy/time=emf=a*change in B/time so, current =emf/R=a*change in B/time*R putting the values we get I=75 mA direction can be determined by lenz law B) 75 mA, from b to a

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