1.

An electron moves in a circular orbit with a uniform speed v. It produces a magnetic field B at the centre of the circle. The radius of the circle is proportional to      [CBSE PMT 2005]

A.            \[\frac{B}{v}\]                     
B.            \[\frac{v}{R}\]
C.            \[\sqrt{\frac{v}{B}}\]        
D.            \[\sqrt{\frac{B}{v}}\]
Answer» D.            \[\sqrt{\frac{B}{v}}\]


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