Answer :

The cross section of AB is twice that of CD.

As they are made of same material, they are going to have same resistivity. Hence, the resistances are;

i.e. RAB = 2 R and RCD = R

Now, let us calculate the force (as direction can be assumed we only concentrate on the magnitude),

The torque is going to be

Similarly, we can find for CD

The net torque is going to be,

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