As Shown in the Figure,a Wire and a 10-Ω Resistor

question 78

Multiple Choice

As shown in the figure,a wire and a 10-Ω 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 field is directed into the plane of the circuit.The magnitude of the magnetic field is steadily decreased from 2.70 T to 0.90 T in a time interval of 96 ms.What is the induced current in the circuit,and what is its direction through the resistor?

• A)75 mA,from b to a
• B)45 mA,from b to a
• C)75 mA,from a to b
• D)45 mA,from a to b
• E)110 mA,from a to b

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