List of top Physics Questions on Magnetic Field asked in KEAM

A particle of charge 10 times that of an electron is revolving in a circular path of radius $0.5 \text{ m}$. If the frequency of rotation is 10 rotations per second, the magnetic field at the centre of the circular path is approximately ($\mu_0 = 4\pi \times 10^{-7} \text{ Hm}^{-1}$)}
The current that has to pass through a single circular loop of radius 10 cm to produce a magnetic field of \(\mu_0\) tesla at its centre is
In a cyclotron, the frequency of revolution of a charged particle of energy E moving in a magnetic field is f. If the energy of the charged particle in it is doubled, then the frequency of revolution of the charged particle is
A wire of certain length carrying current $I$, when bent into a circular coil of single turn produces a magnetic field $B$ at its centre. If the same wire is bent into a circular coil of 3 turns and it carries the same current, then the magnetic field at the centre of the coil is
Two charged particles $2q$ and $q$ having equal momentum enter a uniform magnetic field in a direction perpendicular to the magnetic field. Then their respective radii of circular paths $r_1$ and $r_2$ are in the ratio
A solenoid has 1000 turns per meter and carries a current of \( \frac{7}{\pi} \) A. The magnetic field inside the solenoid is
An $\alpha$ particle and proton are accelerated in cyclotron under idential conditions. Find the ratio of their cyclotron frequncy
When a magnetic field is applied on a stationary electron, it
A particle of mass m and charge q with an initial velocity v is subjected to a uniform magnetic field B along the vertical direction. The particle will
In synchrotron, the required high magnetic fields are generated by
For a circular coil carrying current, the thumb in the right hand thumb rule gives the direction of
Gyromagnetic ratio of an electron is the ratio between
In a cyclotron, if the frequency of the accelerating field is doubled, then the radius of the charged particle moving in a circular path will be
If a current of 1 A is passed through a 1 m long solenoid of 7000 turns, the magnetic field produced at the middle of the solenoid is
The magnetic field at the centre of a current loop of radius \(r\) carrying a current \(I\) is
If a rectangular loop carrying a current I and area ab is placed such that a uniform magnetic field B is in the plane of the loop, then the magnitude of torque on it is
According to Biot-Savart's law, the magnetic field B is
A wire of length 1.2 m carrying a current of 4 A, when placed in a uniform magnetic field 5 T experiences a force of 12 N. Then the angle between the direction of current and magnetic field is
When a proton moves in a uniform magnetic field such that its velocity has a component along the direction of magnetic field, its trajectory will be a
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