$A$ straight wire carrying a current $10\, A$ is bent into a semicircular arc of radius $5\, cm.$ The magnitude of the magnetic field at the center is

Consider the magnetic field produced by a long straight current-carrying wire.

Find the magnetic field at the centre $P$ of a square loop of side length $20 \, cm$ carrying a current of $3 \, A$.

$A$ circular coil is in the $y-z$ plane with its centre at the origin. The coil is carrying a constant current. Assuming the direction of the magnetic field at $x = -25\, cm$ to be the positive direction of the magnetic field,which of the following graphs shows the variation of the magnetic field along the $x$-axis?

The magnetic field at the origin due to the current $I$ flowing in the wire as shown in the figure is:

In a hydrogen atom,an electron moves in a circular orbit of radius $5.2 \times 10^{-11} \, m$ and produces a magnetic induction of $12.56 \, T$ at its nucleus. The current produced by the motion of the electron will be (Given $\mu_0 = 4\pi \times 10^{-7} \, Wb/A \cdot m$)