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Question

An electron (mass = 9×1031kg, charge =1.6×1019 C ) whose kinetic energy is 7.2×1020 J is moving in a circular orbit in a magnetic field of 9×105 weber/m2. The radius of the orbit is

A
1.25 cm
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B
2.5 cm
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C
12.5 cm
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D
25.0 cm
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