Mock Test 1 — Magnetism and Magnetic Effects of Current

The magnetic field at distance $5$ cm from a wire carrying $10$ A:

An electron and proton enter a magnetic field with equal velocities perpendicular to $\vec{B}$. Radii ratio:

A proton ($q = e$) moves in a circular orbit of radius $r$ in field $B$. KE:

The Lorentz force on a charge $q$ moving in $\vec{E}$ and $\vec{B}$:

Two wires $2$ m long, separated by $1$ m, carry currents $5$ A each in opposite directions. Force per metre:

The earth's magnetic field at the equator is approximately:

A diamagnetic material:

Cyclotron frequency of charged particle is:

A circular coil of $N$ turns, radius $R$, current $I$ has magnetic moment:

The dimensions of magnetic flux:

The magnetic field at the centre of a coil of $100$ turns, radius $10$ cm, current $0.1$ A, in $\mu$T (rounded):

A galvanometer of resistance $50$ Ω and full-scale current $2$ mA. The series resistance to convert it into voltmeter reading $10$ V (in Ω, integer):

A circular coil of radius $5$ cm carrying $2$ A. Magnetic moment in $10^{-3}$ A·m² (use $\pi^2 \approx 9.87$):

Assertion (A): Magnetic force does no work on a moving charge. Reason (R): Magnetic force is always perpendicular to velocity.

Assertion (A): A galvanometer cannot be used to measure heavy currents directly. Reason (R): A galvanometer is a low-current instrument, so it must be shunted with a low resistance to convert it to an ammeter.