Level 1

The force acting on a current carrying wire joining two fixed points $A$ and $B$ in a uniform magnetic field

Which among the following is correct regarding diamagnetic materials?

The horizontal component of the earth's magnetic field at a place is $0.25\times {10}^{-4}\mathrm{Wb}/{\mathrm{m}}^2$ and its vertical component is $0.35\times {10}^{-4}\mathrm{Wb}/{\mathrm{m}}^{-4}$. Then the earth's total magnetic field at that place is

The North pole of Earth's magnet is near the geographical

The plane of a dip circle is set in the geographic meridian and the apparent dip is ${\delta }_1$. It is then set in a vertical plane perpendicular to the geographic meridian. The apparent dip angle is ${\delta }_2$. The declination $\theta$ at the place is

The total intensity of the earth's magnetic field at equator is $5$ units. What will be its value at the poles?

For full scale deflection of total $50$ divisions, $50\mathrm{mV}$ voltage is required in galvanometer. The resistance of galvanometer if its current sensitivity is $2 \mathrm{div} /\mathrm{mA}$ will be:

A wire of length, $l$ carries a current $I$ along the $X$- axis. The magnetic force acting on the wire is given by $\overrightarrow{F}=I{B}_{0}L(\hat{\mathrm{k}}-\hat{\mathrm{j}})\mathrm{T}$ where $B_0$ is a constant. The existing magnetic field $\overrightarrow{B}$ is