JIPMER2007PhysicsMagnetic Effects of Current
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
Options
- AB v
- Bv B
- Cv B
- DB v
Correct answer
C. v B
Step-by-step solution
The time period of electron moving in a circular orbit T= circumference of circular path speed = 2 r v and equivalent current due to electron flow I= e T = e (2 r / v) = e v 2 r Magnetic field at centre of circle B= ₀ I 2 r = ₀ e v 4 r^2 r v B