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Q.

The force acting per unit length when a very long straight conductor is carrying a steady current of 1" " A and the direction of the current is from south to north is
(The horizontal component of the earth's magnetic field at the place is 3×105T and the direction of the field is from the geographical south to geographical north.)

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a

3×105Nm1

b

1×105Nm1

c

0

d

1.5×105Nm1

answer is C.

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