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A tightly-wound, long solenoid has n turns per unit length, a radius r and carries a current i. A particle having charge q and mass m is projected from a point on the axis in a direction perpendicular to the axis. What can be the maximum speed for which the particle does not strike the solenoid?

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No. of turns per unit length = n, radius of circle = r/2, current in the solenoid = i, Charge of Particle = q, mass of particle = m  ∴ B = μ0ni

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