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A doubly charged helium atom whose mass is 6.6×10−27kg is accelerated by a voltage of 2400...

A doubly charged helium atom whose mass is 6.6×10−27kg is accelerated by a voltage of 2400 V .

a) What will be its radius of curvature if it moves in a plane perpendicular to a uniform 0.33 T field?

b)What is its period of revolution?

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