Physics
Explain how does the Lenz's law show the conservation of energy in the phenomenon of electromagnetic induction.
Electro-Magnetism
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Answer
Lenz's law is based on the law of conservation of energy. It shows that the mechanical energy is spent in doing work against the opposing force experienced by the moving magnet, and it is transformed into the electrical energy due to which current flows in the solenoid.
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Related Questions
(a) What is electromagnetic induction?
(b) Describe one experiment to demonstrate the phenomenon of electromagnetic induction.
The diagram shows a coil of several turns of copper wire near a magnet NS. The coil is moved in the direction of arrow shown in the diagram.
(i) In what direction does the induced current flow in the coil?
(ii) Name the law used to arrive at the conclusion in part (i).
(iii) How would the current in coil be altered if:
- the coil has twice the number of turns,
- the coil was made to move three times fast?
(a) Describe briefly one way of producing an induced e.m.f.
(b) State one factor that determines the magnitude of induced e.m.f. in part (a) above.
(c) What factor determines the direction of induced e.m.f. in part (a) above?
The diagram, shows a fixed coil of several turns connected to a centre zero galvanometer G and a magnet NS which can move in the direction shown in the diagram.
(a) Describe the observation in the galvanometer if (i) the magnet is moved rapidly, (ii) the magnet is kept stationary after it has moved into the coil, (iii) the magnet is then rapidly pulled out of the coil.
(b) How would the observation in (i) of part (a) change if a more powerful magnet is used?