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The wires which connect the battery ofan automobile to its starting motor carry current of 300 A ( for a short time ). What is the force per unit lenght between the wire if they are 70 cm long and 1.5 cm a part ? Is the force attractive or repulsive ? |
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Answer» Solution :I= 300 A , l= 70 cm, R= 1.5 cm `F = (mu_0I_1I_2)/(2pi r) = ( 4 pi xx 10^(-5) xx 300 xx 300 )/(2 xx 1.5 xx 10^(-2)) = 1.2 N` The force is REPULSIVE. |
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