List of top Physics Questions

Consider a neutron (mass $m$) of kinetic energy $E$ and a photon of the same energy. Let $\lambda_n$ and $\lambda_p$ be the de Broglie wavelength of neutron and the wavelength of photon respectively. Obtain an expression for $\dfrac{\lambda_n{\lambda_p}$.}
Plot a graph showing the variation of current with voltage for the material GaAs. On the graph, mark the region where: (a) resistance is negative, and (b) Ohm's law is obeyed.
Show that the density of the nuclear matter is the same for all nuclei.
Find the temperature at which the resistance of a wire made of silver will be twice its resistance at $20^\circ$C. Take $20^\circ$C as the reference temperature and temperature coefficient of resistance of silver at $20^\circ$C = $4.0 \times 10^{-3\ \text{K}^{-1}$.}
Why is the density of a nucleus much more than that of an atom?
The transition of electron that gives rise to the formation of the second spectral line of the Balmer series in the spectrum of hydrogen atom corresponds to:
A loop carrying a current I clockwise is placed in x - y plane, in a uniform magnetic field directed along z-axis. The tendency of the loop will be to:
Ge is doped with As. Due to doping,
The waves associated with a moving electron and a moving proton have the same wavelength \( \lambda \). It implies that they have the same :
A galvanometer of resistance $G\,\Omega$ is converted into an ammeter of range $0$ to $1\,A$. If the current through the galvanometer is $0.1%$ of $1\,A$, the resistance of the ammeter is:
Ten capacitors, each of capacitance $1\,\mu F$, are connected in parallel to a source of $100\,V$. The total energy stored in the system is equal to:
In a full-wave rectifier, the current in each of the diodes flows for:
(iii) In a full-wave rectifier:
What is meant by displacement current? A capacitor is being charged by a battery. Show that Ampere-Maxwell law justifies continuity and constancy of the current flowing in the circuit.
Determine the current in the \( 3 \, \Omega \) branch of a Wheatstone Bridge in the circuit shown in the figure.
State Bohr’s postulates and derive the expression for the radius of the \( n^{\text{th}} \) orbit.
Derive the Lens Maker’s Formula for a thin convex lens.
Explain the principle and working of an AC Generator or a Transformer (including energy losses).
Explain the principle, construction, and derive the current sensitivity of a moving coil galvanometer.
Define Drift Velocity and establish its relation with electric current.
Derive the condition for a balanced Wheatstone Bridge.
Derive the expression for the capacitance of a parallel plate capacitor (with and without dielectric slab).
Derive the expression for Electric Field Intensity on the axial and equatorial line of a dipole.
State Gauss’s Theorem and use it to find the electric field due to an infinitely long charged wire or a thin spherical shell.
A spring of force constant $15\,\text{N/m}$ is cut into two pieces. If the ratio of their lengths is $1:3$, then the force constant of the smaller piece is ___ $\text{N/m}$.