NEET UG 2003 — Electromagnetism

Three capacitors each of capacity $4 \mu \mathrm{F}$ are to be connected in such a way that the effective capacitance is $6 \mu \mathrm{F}$. This can be done by:

A charge $q$ is located at the centre of a cube. The electric flux through any face is:

A bar magnet is oscillating in the Earth's magnetic field with a period $T$. What happens to its period and motion if its mass is quadrupled?

According to Curie's law, the magnetic susceptibility of a substance at an absolute temperature $T$ is proportional to:

An electric kettle has two heating coils. When one of the coils is connected to a.c. source, the water in the kettle boils in 10 minute. When the other coil is used the water boils in 40 minute. If both the coils are connected in parallel, the time taken by the same quantity of water to boil will be:

Fuse wire is a wire of :

A long solenoid carrying a current produces a magnetic field $B$ along its axis. If the current is doubled and the number of turns per $\mathrm{cm}$ is halved, the new value of the magnetic field is:

A charged particle moves through a magnetic field in a direction perpendicular to it. Then the:

An electron is moving around the nucleus of a hydrogen atom in a circular orbit of radius $r$. The coulomb force $\vec{F}$ between the two is: $\left(\right.$ where $\left.K=\frac{1}{4 \pi \varepsilon_0}\right)$

In a Wheatstone's bridge all the four arms have equal resistance $R$. If the resistance of the galvanometer arm is also $R$, the equivalent resistance of the combination as seen by the battery is:

Two 220 volt, 100 watt bulbs are connected first in series and then in parallel. Each time combination is connected to a 220 volt a.c. supply line. The power drawn by the combination in each case respectively will be:

Which of the following rays are not electromagnetic waves?

A diamagnetic material in a magnetic field moves: