JEE Physics - MCQ Practice Questions

An electron is released from rest in a uniform electric field of magnitude E. After moving through a distance d, what is its kinetic energy?

Two identical conducting spheres have charges +Q and -Q respectively. They are brought into contact and then separated. What is the final charge on each sphere?

A spherical shell of radius R carries a uniformly distributed charge Q. What is the electric field inside the shell at distance r from the center (r < R)?

A non-conducting infinite plane with uniform surface charge density σ produces an electric field. What is the magnitude of this field?

A charge +q is at position (0, 0) and charge -q is at (a, 0). At what point on the x-axis is the electric potential zero?

A conducting rod of length L is moving with velocity v perpendicular to a uniform magnetic field B. If the rod is in electrostatic equilibrium, what is the induced EMF?

For a point charge Q at the origin, if the electric potential at distance r is V(r), what is the electric field magnitude at that point?

A parallel plate capacitor is filled with a dielectric of dielectric constant κ. How does this affect the capacitance compared to vacuum?

A uniformly charged infinite line with linear charge density λ = 2 × 10⁻⁸ C/m is placed along the z-axis. A point charge q = +1 μC is located at a perpendicular distance r = 0.1 m from the line. The electric field due to the line charge at the location of the point charge is perpendicular to the line. If the permittivity of free space is ε₀ = 8.85 × 10⁻¹² F/m, calculate the magnitude of the electric field at the point charge location.

Two identical conducting spheres A and B have charges +Q and +3Q respectively. They are separated by a distance much larger than their radii. When brought into contact and then separated to the original distance, the electrostatic force between them changes by a factor of:

A wire of resistance R is bent into a square loop. What is the equivalent resistance between two adjacent corners?

In a balanced Wheatstone bridge, if the resistance of one arm is changed by 10%, by what percentage should another arm be changed to maintain balance?

A battery of EMF 12V with internal resistance 2Ω is connected to an external resistance of 4Ω. What is the terminal voltage?

In an ammeter shunt connection, if the ammeter has resistance 1Ω and we want to measure up to 10A with a galvanometer of range 1mA, what should be the shunt resistance?

A metallic conductor's resistance increases with temperature. This is primarily because:

A heating element rated 1000W, 200V is connected to a 100V supply. The heat generated will be:

In a meter bridge, the null point is found at 60cm from left. If a standard resistance of 15Ω is on the right, the unknown resistance is:

A copper wire of diameter 1 mm carries a current of 5 A. If the drift velocity of electrons is 0.5 mm/s, find the number density of free electrons in copper. (Given: e = 1.6 × 10⁻¹⁹ C)

A potential divider uses a 100 cm wire of total resistance 10Ω. A cell of EMF 2V and negligible internal resistance is connected across it. What is the potential gradient along the wire?

In a meter bridge experiment, when the null point is at 40 cm from the left end, the unknown resistance is found to be 20Ω. What is the standard resistance used?