the magnetic field shown in the figure consist of the two magnetic fields.

If v is the velocity just required for a charge particles of mass m and charge q to pass through the magnetic field. Particle is projected with velocity 'v' then how much time does such a charge spend in the magntic filed-

Options

A. `(pim)/(2qB)`
B. `(pim)/(qB)`
C. `(pim)/(4qB)`
D. `(3pim)/(2qB)`

Answer

B

Explanation

Time `= (pim)/(2qB) + (pim)/(2qB) = (pim)/(qB)`