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Two long, parallel conductors carry curr...

Two long, parallel conductors carry currents in the same direction as shown in Fig. Conductor A carries a current of 150A and is held firmly in position. Condcutor B carries current `I_B` and is allowed to slide freely up and down (parallel to A) between a set of non-coducting guides. If the mass per unit length of conductor B is `0.001 gcm^-1` , what value of current `I_B` will result in equilibrium when the distance between the two conductors in 2.50cm?

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