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An air-cored solenoid is of length 0.3 m, area of cross section 1.2 xx 10^(-3) m^2and has 2500 turns. Around its central section, a coil of 350 turns is wound. The solenoid and the coil are electrically insulated from each other. Calculate the emf induced in the coil if the initial current of 3 A in the solenoid is reversed in 0.25s. |
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Answer» Solution :`M = (mu_0 N_1N_2 A_2)/(l)` ` = (4PI xx 10^(-7) xx 2500 xx 350 xx 1.2 xx 10^(-3))/(0.3) H = 4.4xx 10^(-3) H` ` e = M (dI)/(DT)` ` e = 4.4 xx 10^(-3) xx (3-(-3))/(0.25) V = 0.1056V` If two solenoids are of unequal length, then length of bigger solenoid is to be CONSIDERED. |
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