MHT CET202120 Sep 2021Evening ShiftPhysicsMagnetic Effects of CurrentActual
An electron (e) moves in circular orbit of radius ' r ' with uniform speed ' V '. It produces magnetic field ' B ' at the center of circle. The magnetic field B is ( ₀= permeability of free space)
Options
- A₀ e 4 ( V r ^2 )
- B₀ e 4 Vr ^2
- C₀ e 4 ( V r )
- D₀ e 4 Vr
Correct answer
A. ₀ e 4 ( V r ^2 )
Step-by-step solution
Magnetic field at the center of a circular coil is given by B = ₀ I 2 r In this case, the current I = e T = eV 2 r B = ₀ eV 4 r ^2