A particle having charge of `20muC` and mass `20mug` moves along as circle of radius `5cm` under the action of a magnetif field `B=0.1` tesla. When the particle is at `P`, uniform transverse electric field is switched on an it is found that the particle continues along the tangent with a uniform velocity. Find the electric field

Options

A. `2V/m`
B. `0.5V/m`
C. `5V/m`
D. `1.5V/m`

Answer

B

Explanation

`r=(mv)/(Bq)` (durign circular path)
`:. v=(Bqr)/m`
`now, qE=(B^2qr)/m`
`:. E=((0.1)^2(20xx10^-6)(5xx10^-2))/((20xx10^-9))`
`=0.5V/m`