equillibrium condition grav force = Electrical force
mg sin theta = E q cos theta
E = mg tan theta/q
E = (0.3*10^-3 * 9.81 * tan 20)/(0.5* 10^-9)
E = 2.14*10^6 N/C (answer)
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since electric force is in right wards and charge is pulled (attracted)
this must hve opposite charge as that E
E towards right is +ve charge
so as the charge q must be +ve charge
A version of this problem appears on some web-based learning sites as a homework problem for...
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