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A proton (m = 1.67 x 10-27 kg) is placed a distance y above a long,...

A proton (m = 1.67 x 10-27 kg) is placed a distance y above a long, horizontal wire of linear charge density λ. The proton is then released from rest. If the magnitude of the initial acceleration of the proton is 0.52 x 10+7 m/s2, what is the value of λ (in C/m)? Take y = 40cm.

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