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An isolated charge q(1) of mass m is sus...

An isolated charge `q_(1)` of mass m is suspended freely by a thread of length l. Another charge `q_(2)` is brought near it `(rgtgtl)`. When `q_(1)` is in equilibrium tension in thread will be

A

1. mg

B

2. `gt mg`

C

3. `lt mg`

D

4. none of these

Text Solution

Verified by Experts

The correct Answer is:
B
Initial tension: `T_(1)=mg`
Final tension `T_(2) cos theta=mg`
or `T_(2)=(mg)/(cos theta)`
Obiviously , `T_(2)gt mg`
Here we have assumed `theta` to be small so that F is almost horizontal.
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