MagnetismHard
Question
Electron of mass m and charge q is travelling with a speed along a circular path of radius r at right angles to a uniform magnetic field of intesity B. if the speed of the electron is doubled and the magnetic field is halved the resting path would have a radius
Options
A.2r
B.4r
C.
D.
Solution
Radius of path is given by r = 
Here, m and q remain unchanged
So,
⇒ r2 = 4r
Here, m and q remain unchanged
So,
⇒ r2 = 4r
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