Magnetic field due to currentHard

Question

An electron of kinetic energy of 7.2 × 10-18 J is revolving on circular path in magnetic field 9 × 10-5 wb/m2 then radius of its circular path is :-

Options

A.1.25 cm.
B.2.5 m.
C.2.5 cm.
D.25.0 cm.

Solution

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