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Consider the situation of the previous problem, (a) Calculate the force needed to keep the sliding wire moving with a constant velocity v.

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Consider the situation of the previous problem, (a) Calculate the force needed to keep the sliding wire moving with a constant velocity v. (b) If the force needed just after t = 0 is F0, find the time at which the force needed will be F0/2.

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e = Bvℓ

=> 2ℓ = ℓ + vt

=> T = ℓ/v

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