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Electricity

Blazing goIITian

 Joined: 1 Apr 2012 Post: 381
12 Jun 2012 16:32:17 IST
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electrostatic
Engineering Entrance , Medical Entrance , AIPMT , JEE Main , AIIMS , JEE Advanced , Physics , Electricity

A pendulum Bob of mass 80mg and carrying a charge of 2*10^-8 is at rest in a uniform horizontal electric field of 20kVm^-. Find the tension in the thread? Answer =8.8*10^-4. How???????

Blazing goIITian

Joined: 22 May 2009
Posts: 2467
8 Jul 2012 13:25:24 IST
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One of the component will balance the weight and other will balance the electric force

Tcos@=80*10^-3*9.8

Tsin@=q*E

Now spuaring adding and taking the square root will give the answer.

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