A large sheet carries uniform surface charge density sigma.A rod of length 2l has a linear charge density lamda on one half and -lama on the other.The rod is hinged at mid point O and makes theta with normal to the sheet.The torque experienced by the rod is


Elementary length. = Eλdx

Now, torque = Eλdxxsinθ


Thus, we get λEsinθl2/2

similarly for lower part torque will be λEsinθl2/2

so net torque = λEsinθl2

so τ =  λEsinθl2/2ε0

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