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A current carrying straight wire is placed along east-west and current is passed through it eastward. The direction of the force acting on it due to horizontal component of earth’s magnetic field is

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due west

due south

vertically upwards

vertically downwards

answer is C.

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Detailed Solution

Current is flowing from west to east and magnetic field of earth is from south to north.

$\vec{F_{m}} = i (\vec{L} \times \vec{B})$

$\hat{F_{m}} = (\hat{i} \times \hat{j}) = \hat{k}$

So, the force will act in vertically upward direction.

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