List of top Physics Questions on Magnetostatics

Write the expression for the magnetic field due to a current element in vector form. Consider a 1 cm segment of a wire, centered at the origin, carrying a current of 10 A in positive x-direction. Calculate the magnetic field \( \mathbf{B} \) at a point \( (1 \, \text{m}, 1 \, \text{m}, 0) \).

A solenoid has a core made of material with relative permeability 400. The magnetic field produced in the interior of solenoid is 1.0 T. The magnetic intensity in SI units is $\alpha \times 10^5$. The value of $\alpha$ is ________.
(Free space permeability $\mu_0 = 4\pi \times 10^{-7}$ SI units.)

A current is flowing along the surface of a long solid cylinder of radius \(R\). Select the correct statement(s):

[(A)] Magnetic field (\(B\)) is minimum along the axis of cylinder
[(B)] Magnetic field (\(B\)) is minimum at the surface of cylinder
[(C)] Magnetic field (\(B\)) is maximum at the surface of cylinder
[(D)] Magnetic field (\(B\)) is maximum along the axis of cylinder
[(E)] Magnetic field (\(B\)) is same all over the cross section of cylinder

A long wire carries a current of 4.00 A. The energy stored in the magnetic field inside the volume of \(1\,\text{mm}^{3}\) at a distance of 10 cm from the wire is given by:

A long wire carrying a current \(i\) is bent to form a plane angle \(\alpha\). The magnetic field \(B\) at a point on the bisector of this angle situated at a distance \(x\) from the vertex is:

Two parallel wires separated by a distance of 10 cm carry currents of 10 A and 40 A along the same direction. Where should a third current be placed to experience no magnetic force?