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(a) Draw a labelled diagram of an a.c.generator. Obtain the expression for the emf induced in the rotating coil of N turns each of cross-sectional area A, in the presence of a magnetic field vecB. (b) A horizontal conducting rod 10 m long extending from east to west is falling with a speed 5.0 ms^(-1) at right angles to the horizontal component of the Earth's magnetic field, 0.3 xx 10^(-4) Wb m^(-2). Find the instantaneous value of the emf induced in the rod. |
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Answer» Solution :(a) See Short Answer Question Number 53. (b) Here length of rod l = 10 m, speed of falling of rod `V = 5.0 m s^(-1)` and HORIZONTAL component of earth.s MAGNETIC FIELD `B_(H) = 0.3 xx 10^(-4) WB m^(-2) = 0.3 xx 10^(-4)T` `therefore` Instantaneous value of induced emf `|varepsilon|= B_(H)lv = 0.3 xx 10^(-4) xx 10 xx 5.0 = 15 xx 10^(-4)V = 1.5 mV` |
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