In a vernier callipers if each centimetre of the main scale is divided into q equal parts and p vernier scale divisions coincide with `(p-1)` main scale divisions, then what will be the be the least count?
A
`(1)/(4pi in_(0)) q^(2)/d^(2)` (repulsive)
B
`(1)/(4pi in_(0)) q^(2)/d^(2)` (attractive)
C
`(1)/(4pi in_(0)) q^(2)/(4d^(2))` (repulsive)
D
`(1)/(4pi in_(0)) q^(2)/(4d^(2))` (attractive)
Text Solution
Verified by Experts
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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