List of top Physics Questions asked in Bihar Board Class XII

If magnetic field \( B \) is perpendicular to surface area vector \( \mathbf{ds} \), then the magnetic flux on area \( ds \) will be:
In an AC circuit, power is lost in only:
An alternating electric current is represented by the equation \( i = 0.6 \sin 100 \pi t \). The frequency of the alternating current is:
Current used in electroplating is:
The energy density of magnetic field \( B \) is:
The magnetic field produced at the centre of a current-carrying circular coil is:
On dividing any magnet of magnetic moment \( M \) parallel to its length into \( n \) equal pieces, the moment of each piece will be:
Which of the following shows hysteresis?
The value of magnetic potential at a distance \( r \) from a pole strength \( m \) is:
What is produced by an induction coil?
A galvanometer is converted into an ammeter by adding:
The value of torque \( \boldsymbol{\tau} \) experienced by a current loop of magnetic moment \( \mathbf{m} \) placed in a magnetic field \( \mathbf{B} \) is:
On oscillating any metallic sphere in a magnetic field, its oscillatory motion is:
The SI unit of self-induction 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 nature of electron beams moving with uniform velocity in the same direction will be:
The value of current obtained in a moving coil galvanometer is proportional to:
Which one of the following is NOT a unit of magnetic field?
If \( n \) equal resistors are first connected in series and then in parallel, the ratio of maximum to minimum resistance will be:
Kirchhoff's second law of electricity is related to:
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:
To increase the sensitivity of a potentiometer:
Picofarad is the unit of: