List of top Questions asked in Bihar Board Class XII

The energy density of magnetic field \( B \) is:
The nature of electron beams moving with uniform velocity in the same direction will be:
The value of torque \( \boldsymbol{\tau} \) experienced by a current loop of magnetic moment \( \mathbf{m} \) placed in a magnetic field \( \mathbf{B} \) is:
The SI unit of self-induction is:
On oscillating any metallic sphere in a magnetic field, its oscillatory motion is:
The working principle of a dynamo is based on:
A magnet is situated near a closed conductor. Current can be produced in the conductor if:
The value of current obtained in a moving coil galvanometer is proportional to:
If \( n \) equal resistors are first connected in series and then in parallel, the ratio of maximum to minimum resistance will be:
To increase the sensitivity of a potentiometer:
Kirchhoff's second law of electricity is related to:
Which one of the following is NOT a unit of magnetic field?
The value of \((p_0 g q)^{1/2}\) is:
An electron of charge \( e \) moves parallel to uniform lines of force in a magnetic field \( B \) with velocity \( v \). The force acting on the electron is:
Picofarad is the unit of:
The capacity of any condenser does not depend upon:
The capacity of a spherical conductor is \(1.0\) pF. Its radius will be:
The dielectric constant of a metal is:
Which of the following is blocked by a capacitor?
Two bulbs of 40 W and 60 W are connected to a 220 V source. The ratio of their resistances will be:
The resistance of a wire is 500 \(\Omega\). Its electrical conductivity will be:
Two equal and opposite charges of 5 coulomb are kept mutually at a distance of 50 cm. The electric dipole moment of the system is:
On moving from the surface of a charged metallic sphere to the center of the sphere, the electric field:
If \( n \) electric dipoles are situated inside a closed surface, the total electric flux coming out from the closed surface will be:
In broad-side-on position, the electric potential due to an electric dipole is: