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A small ball of masss m and charge +q ti...

A small ball of masss m and charge +q tied with a string of length l, rotating in a veticle circle under gravity and a uniform horizontal electric field E as shown. The tension in the string will be minimum for

A

`theta=tan^-1((qE)/(mg))`

B

`theta=pi`

C

`theta=0^@`

D

`theta=pi+tan^-1((qE)/(mg))`

Text Solution

Verified by Experts

The correct Answer is:
D
brgt` T sinalpha=qE`
Tcosalpha=mg`
`:. alpha=tan^-1((qE)/(mg))`
minimum tension will be obtained at `alpha+pi`.
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