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[" An electron is projected at an angle ...

[" An electron is projected at an angle "theta" with a uniform magnetic field.If the pitch of the helical "],[" path is equal to its radius,then the angle of projection is "],[[" 1) "tan^(-1)pi," 2) "tan^(-1)2 pi," 3) "cot^(-1)pi," 4) "cot^(-1)2 pi]]

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