List of top Physics Questions on Magnetic Field

The direction of magnetic lines of force inside the solenoid is from \dots
Choose correct option regarding magnetic lines of force.
The current through a circular coil is halved and the radius of the coil is doubled. If $B_1$ and $B_2$ are respectively the initial and final magnetic field strengths at the center of the coil, then:
An electric field of $8 \times 10^{4}\text{ V m}^{-1}$ and a magnetic field of $6 \times 10^{-3}\text{ T}$ are applied simultaneously on an electron beam such that the path of the beam remains undeviated. Then the speed of the electron will be:
A circular coil of radius $r = 10\text{ cm}$ having $300$ turns carries a current of $2\text{ A}$. The coil is suspended vertically in a uniform magnetic field of strength $7\text{ T}$. If the plane of the coil makes an angle of $30^\circ$ with the magnetic field, the torque needed to prevent it from turning is:
The magnetic field around a current-carrying solenoid is similar to the magnetic field of a:
What happens to the magnetic field at the center of a circular coil if the number of turns is doubled while current remains constant?
The SI unit of magnetic flux density (B) is:
What happens to the magnetic field at the center of a circular coil if the number of turns is doubled while keeping the current constant?
A circular coil of radius \(R\) carries a current \(I\). The magnetic field at its centre is \(B\). At what distance from the centre on the axis of the coil will the magnetic field be \(B/8\)?
A proton \((q = 1.6 \times 10^{-19}\,C)\) enters a magnetic field of \(2\,T\) with a velocity of \(3 \times 10^6\,\text{m/s}\) perpendicular to the field. Find the magnetic force acting on the proton.
Biot-Savart law indicates that an electron moving with a velocity \( \vec{V} \) produces a magnetic field \( \vec{B} \) around it such that
A proton, an electron and an \(\alpha\)-particle enter at right angles to a uniform magnetic field with the same velocity. If R\(_p\), R\(_e\) and R\(_\alpha\) are the radii of circular paths of these particles, then
A charged particle moves in a magnetic field \(B\) with velocity components both along and perpendicular to \(B\). What is its path?
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
The SI unit of Magnetic Induction is:
What is the SI unit of magnetic induction?
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
What is the SI unit of magnetic induction?
Calculate the radius of a circular path for an electron moving through a magnetic field \(B = 12 \times 10^{-4}\,\text{T}\) with \(v = 3.2 \times 10^{7}\,\text{m/s}\).
What is the SI unit of Magnetic Induction?
What is the SI unit of Magnetic Induction?
A solenoid has 1000 turns per meter and carries a current of \( \frac{7}{\pi} \) A. The magnetic field inside the solenoid is