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The simple rotating loop between pole faces connected to a battery and resistor through a switch, the specifications of this machine are radius = 0.5m, length 1m, resistance = 0.3 ohms and magnitude strength = 0.25T is supplied with 120V. Suddenly the switch is closed at t=0, what is observed in the circuit?
  • a)
    Current will flow but zero induced EMF
  • b)
    Current will not flow and zero induced EMF
  • c)
    Current will not flow but EMF is induced
  • d)
    Current will flow and EMF will also be induced
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
The simple rotating loop between pole faces connected to a battery and...
  • When the switch is closed at t=0, the rotating loop becomes part of a closed circuit, and current starts to flow in the circuit. The induced electromotive force (EMF) in the rotating loop, given by Faraday's law, is proportional to the rate of change of magnetic flux. In this case, as the loop rotates in a uniform magnetic field (0.25T) with a constant angular velocity, there is no change in the magnetic flux linked with the loop. Therefore, the induced EMF will be zero.
  • However, the current will still flow through the loop, driven by the applied voltage (120V) and the loop's resistance (0.3 ohms). The loop behaves as if it is just a resistor in the circuit, and current will flow according to Ohm's law (V = IR).
  • So, the correct answer is A: Current will flow, but zero induced EMF.
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The simple rotating loop between pole faces connected to a battery and resistor through a switch, the specifications of this machine are radius = 0.5m, length 1m, resistance = 0.3 ohms and magnitude strength = 0.25T is supplied with 120V. Suddenly the switch is closed at t=0, what is observed in the circuit?a)Current will flow but zero induced EMFb)Current will not flow and zero induced EMFc)Current will not flow but EMF is inducedd)Current will flow and EMF will also be inducedCorrect answer is option 'A'. Can you explain this answer?
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