As shown in the figure, a wire and a 10 Ohm resistor are used to form a circuit in the shape of a square with dimensions 20 cm by 20 cm. A uniform but non-steady magnetic Held is directed into the plane of the circuit. The magnitude of the magnetic field of the magnetic field is steadily decreased from 2.70 T to 0.90 T In a time interval at 96.rms. What is the induced current in the circuit, what is its direction through the resistor 45 mA, from a to b 75 mA. From b to a 75 mA, from a to b 110mA from a to b 45 mA, from b to a
E = d phi / dt = d/dt (B A)
E = A * dB/dt
= (0.20)2 * (2.7 - 0.9)/(96 * 10-3)
= 0.75 A = 75 mA [from b to a]
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