A rigid rod of length 2 L is acted upon by some forces. All forces labelled as F have the same ma...

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A rigid rod of length 2 L is acted upon by some forces. All forces labelled as F have the same magnitude. Which cases have a non-zero net torque acting on the rod about its centre?
(a) I and II only
(b) II and III only
(c) I and III only
(d) The net torque is zero in all cases.

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