Browse and search thousands of solved questions for your preparation.
Free questions with full explanations — locked behind signup to protect quality.
The variation of susceptibility ($\chi$) with absolute temperature ($T$) for a paramagnetic material is represented as:
A thin diamagnetic rod is placed vertically between the poles of an electromagnet. When the current in the electromagnet is switched on, then the diamagnetic rod is pushed up, out of the horizontal magnetic field. Hence the rod gains gravitational potential energy. The work required to do this comes from:
Three different objects of mass $m_1$, $m_2$ and $m_3$ are allowed to fall from rest and from the same point 'O' along three different frictionless paths. The speeds of the three objects, on reaching the ground, will be in the ratio of:
If $\theta_1$ and $\theta_2$ be the apparent angles of dip observed in two vertical planes at right angles to each other, then the true angle of dip $\theta$ is given by:
The magnetic susceptibility is negative for
A bullet of mass $m$ hits a stationary block of mass $M$ elastically. The transfer of energy is the maximum, when:
A man fires a bullet of mass $200 \text{ g}$ at a speed of $5 \text{ m/s}$. The gun is of one kg mass. By what velocity the gun rebounds backwards?
A magnetic needle suspended parallel to a magnetic field requires $\sqrt{3}$ J of work to turn it through $60^\circ$. The torque needed to maintain the needle in this position will be:
There are four light-weight-rod samples A, B, C, D separately suspended by threads. A bar magnet is slowly brought near each sample and the following observations are noted: (i) A is feebly repelled (ii) B is feebly attracted (iii) C is strongly attracted (iv) D remains unaffected Which one of the following is true?
In a circus stuntman rides a motorbike in a circular track of radius $R$ in the vertical plane. The minimum speed at highest point of track will be:
A vibration magnetometer placed in a magnetic meridian has a small bar magnet. The magnet executes oscillations with a time period of 2 s in earth's horizontal magnetic field of $24\ \mu\text{T}$. When a horizontal field of $18\ \mu\text{T}$ is produced opposite to the earth's field by placing a current-carrying wire, the new time period of the magnet will be:
The venturi-meter works on:
The magnetic moment of a diamagnetic atom is:
The best suited curve showing the variations of susceptibility ($\chi$) of a paramagnetic material in free space with temperature ($T$) is:
A particle moves with a velocity $(5\hat i-3\hat j+6\hat k)\text{ ms}^{-1}$ horizontally under the action of a constant force $(10\hat i+10\hat j+20\hat k)\text{ N}$. The instantaneous power supplied to the particle is:
A bar magnet is hung by a thin cotton thread in a uniform horizontal magnetic field and is in the equilibrium state. The energy required to rotate it by $60^\circ$ is $W$. Now the torque required to keep the magnet in this new position is:
Curie temperature is the temperature above which:
Above Curie temperature:
When a body moves with a constant speed along a circle
A particle is displaced through $(3\hat i+4\hat j)\text{ m}$ by force $2\hat i\text{ N}$. The work done is: