List of top Physics Questions on Magnetic Effects of Current and Magnetism asked in MET

The horizontal component of earth’s magnetic field at a place is \(0.4 \times 10^{-4}\,T\). If the angle of dip is \(45^\circ\), the value of total intensity is:
Mixed He\(^+\) and O\(^{2+}\) ions (mass of He\(^+\) = 4 amu and that of O\(^{2+}\) = 16 amu) beam passes a region of constant perpendicular magnetic field. If kinetic energy of all the ions is same, then
A charged particle travels along a straight line with a speed $\nu$ in a region where both electric field $\mathbf{E}$ and magnetic fields $\mathbf{B}$ are present. It follows that}
A solenoid of length $50~\mathrm{cm}$ and a radius of cross-section $1\mathrm{cm}$ has 1000 turns of wire wound over it. If the current carried is 5A, the magnetic field on its axis, near the centre of the solenoid is approximately (permeability of free space $\mu_{0} = 4\pi \times 10^{-7}\mathrm{T}\cdot \mathrm{m / A}$)
A straight conductor carries a current of 5 A. An electron travelling with a speed of $5\times 10^{6}\mathrm{ms}^{-1}$ parallel to the wire at a distance of $0.1\mathrm{m}$ from the conductor, experiences a force of}
A battery of emf 12 V and internal resistance $2\Omega$ is connected in series with a tangent galvanometer of resistance $4\Omega$. The deflection is $60^{\circ}$ when the plane of the coil is along the magnetic meridian. To get a deflection of $30^{\circ}$, the resistance to be connected in series with the tangent galvanometer is
A, B and C are parallel conductors of equal lengths carrying currents $I$, $I$ and $2I$ respectively. Distance between A and B is $x$. Distance between B and C is also $x$. $F_{1}$ is the force exerted by B on A. $F_{2}$ is the force exerted by C on A. Choose the correct answer.}
Two long straight wires are set parallel to each other. Each carries a current in the same direction and the separation between them is $2r$. The intensity of the magnetic field mid-way between them is}
A long solenoid of length $L$ has a mean diameter $D$. It has $n$ layers of winding of $N$ turns each. If it carries a current $i$, the magnetic field at its centre will be
A current carrying coil is bent sharply so as to convert it into a double loop both carrying current in the same direction. If B be the initial magnetic field at the centre, then what will be the final concentric magnetic field?
A long wire carries a steady current. It is bent into a circle of one turn and the magnetic field at the centre of the coil is B. It is then bent into a circular loop of n turns. The magnetic field at the centre of the coil will be:
Two bar magnets having same geometry with magnetic moments m and 2m, are firstly placed such that their similar poles are on the same side. The time period of oscillation is $T₁$. When the polarity of one is reversed, the time period is $T₂$. Then:
A solenoid of 2.5 m length and 2.0 cm diameter possesses 10 turns per cm. A current of 0.5 A is flowing through it. The magnetic induction at axis inside the solenoid is:
In an L-C-R circuit, which one of the following statements is correct?
If value of surface tension of a liquid is 70 dyne/cm, then its value in N/m will be
An inductor is connected to a battery through a switch. Induced emf is \(e_1\) when the switch is pressed and \(e_2\) when the switch is opened. Then
A balloon contains \(1500\ \mathrm{m}^3\) of helium at \(27^{\circ}\mathrm{C}\) and 4 atmospheric pressure. The volume of helium at \(-3^{\circ}\mathrm{C}\) temperature and 2 atmospheric pressure will be
The angular velocities of three bodies in simple harmonic motion are \(\omega_{1},\omega_{2},\omega_{3}\) with their respective amplitudes as \(A_{1},A_{2},A_{3}\). If all the three bodies have same mass and velocity, then
If 10 percent of the current passes through a moving coil galvanometer of resistance 99 ohm. Then the shunt resistance will be:
As the temperature of hot junction increases, the thermo emf
A proton and an \( \alpha \)-particle enter a uniform magnetic field perpendicularly with the same speed. If proton takes 25 \( \mu \)s to make 5 revolutions, then the periodic time for the \( \alpha \)-particle would be
Which of the following statements is wrong?
A binary sequence is an array of 0's and 1's. The number of $n$-digit binary sequences which contain even number of 0's is
In electrophilic aromatic substitution reaction, the nitro group is meta directing because it
The magnetic susceptibility of a paramagnetic material at \( -73^\circ \text{C} \) is 0.0075. Its value at \( -173^\circ \text{C} \) will be: