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The horizontal component of the earth’s ...

The horizontal component of the earth’s magnetic field at a certain place is `3.0 x×10^(-5)` T and the direction of the field is from the geographic south to the geographic north. A very long straight conductor is carrying a steady current of 1A. What is the force per unit length on it when it is placed on a horizontal table and the direction of the current is (a) east to west, (b) south to north?

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