1.

An electron (mass = 9´ 10?31kg. Charge = 1.6 ´ 10?19C) whose kinetic energy is 7.2 ´ 10?18 joule is moving in a circular orbit in a magnetic field of 9 ´ 10?5 weber/m2. The radius of the orbit is                                                   [MP PMT 2002]

A.            1.25 cm                                   
B.            2.5 cm
C.            12.5 cm                                   
D.            25.0 cm
Answer» E.


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