List of top Physics Questions on Magnetic Field asked in KEAM

A conductor of length 20 cm carrying a curent of 5A is placed at an angle of 30° to the extemal magnetic field of 0.5 T. The.force acting on it is
The magnetic field at the centre of a circular coil of \(50\) turns and radius \(10\) cm carrying a current of \(1\) A, in tesla is
A coil of \(50\) turns carrying a current of \(2\) A in a magnetic field of \(0.5\) T. The torque acting on the coil is
A long solenoid with \(500\) turns per unit length carries a current of \(1.5\) A. The magnetic induction at one of the ends of the solenoid on its axis in tesla is
Consider a circular loop of radius R on the $xy$-plane carrying a steady current anticlockwise. The magnetic field at the center of the loop is given by
Consider two parallel current carrying conductors separated by a distance. Which one of the following statements is true?
A particle of mass \( m \) and charge \( q \) with an initial velocity \( \vec{v} \) is subjected to a uniform magnetic field \( \vec{B} \) along the vertical direction. The particle will
The magnitude of a magnetic field at the centre of a circular coil of radius R, having N turns and carrying a current I can be doubled by changing
An electron is moving with a velocity $2 \times 10^6$ m/s along positive $x$-direction in the uniform electric field of $8 \times 10^7$ V/m applied along positive $y$-direction. The magnitude and direction of a uniform magnetic field (in Tesla) that will cause the electrons to move undeviated along its original path is
A rectangular conducting loop of length $4\sqrt{2}$ m and breadth 4 m carrying a current of 5 A in the anti-clockwise direction is placed in the $xy$-plane. The magnitude of the magnetic induction field vector $B$ at the intersection of the diagonals is (Use $\mu_0=4\pi\times10^{-7}\,\text{NA}^{-2}$)
A particle of charge $Q$ moves with a velocity $\vec{v}=a\hat{i}$ in a magnetic field $\vec{B}=b\hat{j}+c\hat{k}$, where $a, b$ and $c$ are constants. The magnitude of the force experienced by the particle is
A proton moves with a speed of $5.0 \times 10^6$ m/s along the $x$-axis. It enters a region where there is a magnetic field of magnitude $2.0$ Tesla directed at an angle of $30^\circ$ to the $x$-axis and lying in the $xy$ plane. The magnitude of the magnetic force on the proton is
If the cyclotron oscillator frequency is $16$ MHz, then what should be the operating magnetic field for accelerating the proton of mass $1.67 \times 10^{-27}$ kg?}
The wire of length $\ell$ is bent into a circular loop of a single turn and is suspended in a magnetic field of induction $B$. When a current $I$ is passed through the loop, the maximum torque experienced by it is
A particle having charge 10 times that of the electron revolves in a circular path of radius 0.4 m with an angular speed of one rotation per second. The magnetic induction produced at the centre of the circular path is
Two long parallel wires carrying equal currents which are 8 cm apart produce a magnetic field of \(200\,\mu T\) midway between them. The magnitude of the current in each wire is
The ratio of the magnetic fields produced at the centre of a solenoid for a flow of current 1 A to that produced inside toroid for the flow of current 2 A both having same number of turns per unit length is
Two identical coils of 5 turns each carry 1 A and 2 A current respectively. Assume they have common centre with their planes parallel to each other. If their radius is 1 m each and the direction of flow of current in the coils are in opposite directions, then the magnetic field produced on its axial line at a distance of \(\sqrt{3}\) m from the common centre is (in tesla)
A proton is travelling along the X-direction with velocity \(5 \times 10^6\,ms^{-1}\). The magnitude of force experienced by the proton in a magnetic field \(\vec{B} = (0.2\hat{i} + 0.4\hat{k})\) tesla is
Identify the wrong statement
A single turn circular coil is connected to a cell as shown. Magnetic field at the centre \(O\) of the coil is
If the radius of the dees of cyclotron is \(r\), then the kinetic energy of a proton of mass \(m\) accelerated by the cyclotron at an oscillating frequency \(\nu\) is
The magnitude of the magnetic field inside a long solenoid is increased by
If the radius of the dees of cyclotron is \(r\), then the kinetic energy of a proton of mass \(m\) accelerated by the cyclotron at an oscillating frequency \(\nu\) is
The magnitude of the magnetic field inside a long solenoid is increased by