Question 133 of 151

PQ is an infinite current carrying conductor. AB and CD are smooth conducting rods on which a conductor EF moves with constant velocity V as shown. The force needed to maintain constant speed of EF is –

                    

1. 1VRμ0IV2π ln ba2                        2. μ0IV2π ln ba21VR

3. μ0IV2π ln ba2VR                          4. VRμ0IV2π ln ba2