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389b - — — The answer is(b When the current flows...

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Unformatted text preview: —+— The answer is (b) When the current flows through an inductor. it sets up a ,_ magnetic flux through its coils. When the current changes. 1 the flux changes. Faradag's and Lenz’s Laws tell us that a W— self-induced emf wilt be created that opposes the change. : 'a' is not true. To establish a current through an inductor, the voltage source has to do work against the selfrinduced emf. The opposite statement is true. 'b’ is true. The work done by the voltage source to establish the current through the inductor is stored as magnetic energy in the field of the inductor. *c’ is not true. After the circuit is switched off, the flux within the inductor produces an emf opposing the change, leading to a current that dissipates as the energy stored within the inductor depletes itself. 'd’ is not true. Substituting "capacitor plates" for "inductor coils“ makes the statement true. CARhCITflRS STCIRE ENERGY I|I'r'HEli'i WCIRH I5 DCiHE TCI MID'III'E CHARGES AEAIHSTAH ELECTRIC FIELEI. iHEILICTCiRS STURE ElilEFI‘JIi"!I I|I'II"I'IEI'il WCIRH IE DUNE 1-4;. MCWE CI'MRCES AGMHST AMENEI'IC FIELD. © £3395 .J WHEEL ...
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