List of top Physics Questions

A rectangular loop carrying a current \( i \) is placed in a uniform magnetic field \( B \). The area enclosed by the loop is \( A \). If there are \( n \) turns in the loop, the torque acting on the loop is given by:
Dimensions of a block are \( 1 \, \text{cm} \times 1 \, \text{cm} \times 100 \, \text{cm} \). If the specific resistance of its material is \( 3 \times 10^{-7} \, \Omega \, \text{m} \), then the resistance between the opposite rectangular faces is:
The magnitude and direction of the current in the circuit shown will be:
An infinite line charge, with coordinates \( x = 1 \) cm and charge density \( \lambda \), produces an electric field at point A at distance r from the line. If the charge on line is \( 10 \mu C \), then what is the electric field at point A?
The capacity of a capacitor is \( 4 \times 10^{-6} \, \text{F} \) and its potential is 100 V. The charge on the plates is:
A cube of side 5 cm is placed in a uniform field \( E \), where \( E = 5 \times 10^4 \, \text{N/C} \). The flux through the cube is:
A glass rod rubbed with silk is used to charge a gold leaf electroscope, and the leaves are observed to diverge. The electroscope is then charged with X-rays for a short period. Then the leaves will:
A passenger in an open car travelling at $30\, m / s$ throws a ball out over the bonnet. Relative to the car the initial velocity of the ball is $20 m / s$ at $60^{\circ}$ to the horizontal. The angle of projection of the ball with respect to the horizontal road will be :

Four electric charges \(+q, +q, -q\) and \(-q\) are placed at the corners of a square of side \(2L\) (see figure). The electric potential at point \(A\), midway between the two charges \(+q\) and \(+q\), is

Which of the following is not an example of perfectly inelastic collision
A steady current flow in a metallic conductor of non-uniform cross-section. The quantity/quantities remaining constant along the whole length of the conductor is/are
An ideal refrigerator has a freezer at a temperature of $-13^{\circ} C$. The coefficient of performance of the engine is $5$. The temperature of the air (to which heat is rejected) will be
Natural length of a spring is $60 \,cm$ and its spring constant is $4000 \,N / m$. A mass of $20\, kg$ is hung from it. The extension produced in the spring is $\left(\right.$ take $\left.g=9.8 \,m / s ^{2}\right)$ :
A cube has a side of length $1.2 \times 10^{-2} m$. Calculate its volume.
The magnitude of electric field intensity $E$, such that an electron placed in it would experience an electrical force equal to its weight, is given by
The linear momentum $p$ of a body moving in one dimension varies with time $t$ according to the equation $p = a + bt^2$, where $a$ and $b$ are positive constant. The net force acting on the body is
The force constant of a spring gun is $50 \,N / m$. If a ball of $20 \,g$ be shoot by the gun, so that its spring is compressed by $10 \,cm$, the velocity of the ball is:
Fast neutrons can easily be solved down by
If a new planet is discovered rotating around sun with the orbital radius double that of the earth, then what will be its time period? (in earth's days) (Take $\sqrt{2}=1.4$ )
An electron is accelerated under a potential difference of 182 V. The maximum velocity of electron will be (Charge of electron is $1.6 \times 10^{-19}C $ and its mass is $9.1 \times 10^{-31}kg) $
The mobility of charge carriers increases with
Dimensions of a block are $1\,cm � 1\,cm � 100\,cm$. If specific resistance of its material is $3\times 10^{-7} \,\Omega\, m$, then the resistance between the opposite rectangular faces is
A coil of resistance $10\,\Omega$ and inductance $5\, H$ is connected to a $100\, V$ battery. Then the energy stored in the coil is

Polarising angle for water is 53\(^{\circ}\)4'. If the light is incident at this angle on the surface of the water and reflected the angle of refraction is

In a magnetic field of $0.05\, T,$ area of a coil changes from $101\, cm^2$ to $100\, cm^2$ without changing the resistance which is $2\,\Omega$. The amount of charge that flow during this period is