A long straight wire carries a certain current and produces a magnetic field `2 xx 10^-4 Weber//m^2` at a perpendicular distance of 5 cm from the wire. An electron situated at 5 cm from the wire. An electron situated at 5cm from the wire moves with a velocity `10^7 m//s` towards the wire along perpendicular to it. The force experience by the electron will be (charge on electron `1.6 xx 10^-19 C)`.

Options

A. 3.2 N
B. `3.2 xx 10^(-16)` N
C. `1.6 xx 10^(-16)` N
D. Zero

Answer

B

Explanation

`F = qvB = 1.6 xx 10^(-19) xx 10^(7) xx 2 xx 10^(-4) = 3.2 xx 10^(-16) N`