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An air-cored solenoid is of length 0.3 m, area of cross section 1.2 xx 10^(-3) m^(2) and has 2500 turns. A roand its central section, a coil of 350 turns is wound. The solenoid and the coil are electrically insulated from each other. Calculate the enfinduced 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_(1)N_(2)A_(2))/(l)` `=(4pi xx 10^(-7) xx 2500 xx 350 xx 1.2 xx 10^(-3))/(0.3)H=4.4 xx 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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