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In a vernier callipers, one main scale d...

In a vernier callipers, one main scale division is x cm and n divisions of the vernier scale coincide with (n-1) divisions of the main scale. The least count (in cm) of the callipers is :-

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The correct Answer is:
D
As given in paragraph, it is treated as `+q` and `-q` point charge at a distance `2a`
`F=1/(4pi in_(0))((-q)(q))/((2d)^(2))`
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