Question

Region of the magnetic field shown in the figure consist of two uniform magnetic fields. If v is the velocity just required for a charge q of particle of mass m and charge to pass through the region of magnetic field. Particle is projected with velocity "v' then how much time does such a charge spend in the region of magnetic field ?

• A. $\frac { \pi \mathrm { m } } { 2 \mathrm { qB } }$
• B. $\frac { \pi \mathrm { m } } { \mathrm { qB } }$
• C.
• D.

Answer 1

Answer: (B)

$\frac { \pi \mathrm { m } } { \mathrm { qB } }$

Answer 2

Time = +

= $\frac { \pi \mathrm { m } } { \mathrm { qB } }$