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Analysis of Force Equation

A conducting ...

Question

A conducting rod PQ is moving parallel to X-axis in a uniform magnetic filed directed in positive Y-direction. The end P of the rod will become

A

negative

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B

positive

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C

neutral

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D

sometimes negative

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Solution

The correct option is B positive
Force of positive charges in rod = $q \to v \times \to B$
As $v$ is along x axis and $B$ is along y axis the force will be along the z axis. Therefore the positive charges will move towards the end P and it will become positive charged.

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