List of top Physics Questions on Magnetic Field asked in COMEDK UGET

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:
A current carrying closed loop in the form of a right isosceles triangle \(XYZ\) is placed in a uniform magnetic field \(B\) acting along \(XY\) of the loop. If the magnetic force on the arm \(YZ\) is \(\sqrt{2}F\), then the force on the arm \(XZ\) is:
A straight wire of mass \(250\,\text{g}\) and length \(2.5\,\text{m}\) carries a current of \(4\,\text{A}\). It can be suspended in mid air by a uniform horizontal magnetic field of magnitude:
In a particular case \(X\), a certain length of insulated copper wire is bent to form double loops of equal radii. In another case \(Y\) the same copper wire is bent to form three loops of equal radii. If the same steady current is passed through the copper wire in both the cases, the ratio of magnetic field at the centre in the case \(X\) to that in case \(Y\) is:
A rectangular coil of length 10 cm and breadth 9 cm carries a current of 10 A. A long straight conductor carrying a current of 20 A is placed 1 cm from the coil parallel to its length and in the same plane of the coil. What will be the net force acting on the straight conductor?
Which physical quantity has the unit joule tesla?
In to a uniform transverse magnetic field, two charged particles having the same mass and charge enter and move in two different circular paths. The ratio of the radii of curvatures of the circular paths is \( 1 : 4 \). What would be the ratio of their respective velocities?