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> Learn Additional Exercise 4 > The wires which connect the battery of an automobile...
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The wires which connect the battery of an automobile to its starting motor carry a current of 300 A (for a short time). What is the force per unit length between the wires if they are 70 cm long and 1.5 cm apart? Is the force attractive or repulsive?

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Current in both wires, I = 300 A Distance between the wires, r = 1.5 cm = 0.015 m Length of the two wires, l = 70 cm = 0.7 m Force between the two wires is given by the relation, Where, = Permeability of free space = Since the direction of the current in the wires is opposite, a repulsive force exists...
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Current in both wires, I = 300 A Distance between the wires, r = 1.5 cm = 0.015 m Length of the two wires, l = 70 cm = 0.7 m Force between the two wires is given by the relation, Where, = Permeability of free space = Since the direction of the current in the wires is opposite, a repulsive force exists between them. read less
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