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Use Lenz's law to determine the direction of induced current in the situations described by Fig. 6.04 : (a). A wire of irregular shape turning into a circular shape, (b) A circular loop being deformed into a narrow straight wire. |
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Answer» Solution :(a) When a wire of irregular shape turns into a circular shape, the area enclosed by the loop increases and, consequently, the MAGNETIC FLUX linked with the loop.increases. In accordance with Lenz.s law the induced CURRENT tends to oppose the increase in flux and it is possible only when induced current flows along adcba (i.e., in an anticlockwise direction). (b) When a circular loop is being deformed into a narrow straight wire type rectangular loop as shown in Fig. 6.04(b), SURFACE area and hence outward magnetic flux decreases. Consequently, in accordance with Lenz.s law, the induced currents want to add to the magnetic flux. It is possible if induced current is anticlockwise i.e., along a.d.c.b. so that the flux DUE to induced current is in same direction as flux due to existing magnetic field. |
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