NEET Questions

The energy density in the electric field between the plates of a capacitor with capacitance C and voltage V is proportional to:

A metal wire of Young's modulus $2 imes 10^{11} \, N/m^2$ undergoes a strain of $10^{-3}$. What is the energy stored per unit volume in the wire?

Strain energy density is defined as:

The strain energy per unit volume of a stretched wire is given by:

Two wires of the same material and length but different cross-sectional areas $A_1$ and $A_2$ ($A_1 > A_2$) are stretched by the same force. Which wire will have greater strain energy density?

The ratio of the electric field energy density ($u_E$) to the magnetic field energy density ($u_B$) in an electromagnetic wave is:

If the intensity of an electromagnetic wave is doubled, how does the energy density of the electric field component change?

Which of the following statements is true about the energy density of electromagnetic waves in vacuum?

An electromagnetic wave has an electric field amplitude of $E_0$. If the permeability of free space is $\mu_0$ and the permittivity is $\epsilon_0$, what is the average energy density of the electromagnetic wave?

A parallel plate capacitor having a plate separation of $2mm$ is charged by connecting it to a $300V$ supply. The energy density is