NEET UG 2002 — Electromagnetism

For a series LCR circuit the power loss at resonance is:

Two bar magnets having geometry with magnetic moments $M$ and $2 M$ are first placed in such a way that their similar poles are same side then its time period of oscillation is $T_1$. Now the polarity of one of the magnet is reversed then the time period of oscillation is $T_2$, so:

The velocity of the electromagnetic wave is parallel to:

A capacitor of capacitance $C_1$ charged up to $V$ volt and then connected to an uncharged capacitor $C_2$. Then, the final potential difference across each will be:

Specific resistance of a conductor increase with:

Some charge is being given to a conductor. Then, its potential:

Identical charges $(-q)$ are placed at each corner of a cube of side ' $b$ ' then the electrical potential energy of charge (+ $q$ ) which is placed at the centre of cube will be:

The magnetic field of a given length of wire for a single turn coil at the centre is ' $B$ ' then, its value for two turns coil for the same wire is:

For a cell, terminal potential difference is $2.2 \mathrm{~V}$ when circuit is open. If it reduces to $1.8 \mathrm{~V}$ when the cell is connected to a resistance of $5 \Omega$. The internal resistance of cell $(r)$ is then:

What is the cause of the 'Greenhouse effect'?

To convert a galvanometer into a voltmeter one should connect a:

A charge ' $q$ ' moves in a region where the electric field and the magnetic field both exist, then the force on it is:

Which is having a minimum wavelength?