KCET2010PhysicsMagnetic Effects of Current
An electron enters the space between the plates of a charged capacitor as shown. The charge density on the plate is . Electric intensity in the space between the plates is E. A uniform magnetic field B also exists in the space perpendicular to the direction of E The electron moves perpendicular to both E and B without any change in direction. The time taken by the electron to travel a distance l in the space is
Options
- Al ₀ ~B
- BB ₀ l
- C₀ l ~B
- D₀ l B
Correct answer
C. ₀ l ~B
Step-by-step solution
Here, magnetic force = electrostatic force aligned q v B &=q E v &= E B &= ₀ B aligned The time taken by electron to travel a distance 1 in that space aligned t= 1 v &= 1 ₀ B &= ₀ l B aligned