Question

Energy associated with a moving charge is due to

• A. Electric field
• B. Magnetic field
• C. Both $\left(a\right)$ and $\left(b\right)$
• D. None of these

Answer 1

The correct option is C

Both $\left(a\right)$ and $\left(b\right)$

1. The Lorentz force (or electromagnetic force) is the combination of the electric and magnetic force on a point charge due to an electromagnetic field.
2. A particle of charge $q$ moving with a velocity $v$ in an electric field $E$ and a magnetic field $B$ experiences a force of, $F=qE+qv\times B$
3. It says that the electromagnetic force on a charge $q$ is a combination of a force in the direction of the electric field $E$ proportional to the magnitude of the field and the quantity of charge, and a force at right angles to the magnetic field $B$ and the velocity $v$ of the charge, proportional to the magnitude of the field, the charge, and the velocity.
4. Variations on this basic formula describe the magnetic force on a current-carrying wire (sometimes called Laplace Force).
5. According to the Lorentz force, the moving of charged particles will create an electric field and along with the electric field, a magnetic field is produced in the transverse direction.
6. Hence, the energy associated with a moving charge is due to both magnetic and electric fields associated with moving charges.

Therefore, option C is correct.