The mechanical energy spent by the external agency is converted into electrical energy stored in the coil. This relates to:
Correct answer: C. Lenz's law
- A. Ohm's law
- B. Coulomb's law
- C. Lenz's law
- D. Newton's law of motion
Explanation
Lenz's law of electromagnetic induction states that the direction of the current induced in a conductor by a changing magnetic field is such that the direction of magnetic field created by the induced current opposes the initial magnetic field which produced it.It also implies the law of conservation of energy by showing that the mechanical energy spent in doing work, against the opposing force, is transformed into the electrical energy due to which current flows in the solenoid.
This question appeared on the ETEA MDCAT 2015 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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