Question

The net charge in a current carrying wire is zero, still the magnetic field exerts a force on it. This is because a magnetic field exerts force on

• A. stationatry charge
• B. moving charge
• C. a positive charge only
• D. a negative charge only

Answer 1

The correct option is B moving charge

Magnatic force $\overrightarrow{\left(F\right)}$ on moving charge $q$ with velocity $\overrightarrow{B}$ in magnatic field is given by $\overrightarrow{V}$
$$\overrightarrow{F}=q(\overrightarrow{V}\times \overrightarrow{B})$$
In current carrying wire, net charge is zero because of equal number of electrons and protons present in the wire, but only electrons are moving.

$\therefore$ Magnetic field $\overrightarrow{(V})$ can exerts force on the moving charge i.e,. electrons in current carrying wire.

Hence, option $\left(b\right)$ is correct answer.