The counter torque produced in the moving coil of generator is called:
Correct answer: D. all of these
- A. resotoring torque
- B. defelection torque
- C. back motor effect
- D. all of these
Explanation
When the current I passes through the coil, the coil experiences torque, which rotates the coil through an angle alpha. Due to deflection, suspension wire twist gives the restoring force; if the restoring force is CQ while the deflection torque is BIAN Cos alpha, then BIAN Cos alpha=CQ. Hence, all of the options represent the same counter torque produced in the generator.
This question appeared on the ETEA MDCAT 2011 paper, which you can sit online with every answer explained.
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About Lenz's Law
Lenz's law states that the induced current flows in a direction that opposes the change in magnetic flux producing it. Questions connect this rule with Faraday's law, magnetic flux, induced emf and the direction of motion or current, while distinguishing opposition to flux change from opposition to the magnetic field itself.
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