AIPMT 2008 Main Mock Test

A galvanometer of resistance $50\Omega$ is connected to a battery of $3\text{V}$ along with a resistance of $2950\Omega$ in series. A full scale deflection of $30$ divisions is obtained in the galvanometer. In order to reduce this deflection to $20$ divisions, the resistance in series should be:

Curie temperature is the temperature above which:

A long solenoid has $500$ turns. When a current of $2\text{ampere}$ is passed through it, the resulting magnetic flux linked with each turn of the solenoid is $4\times 10^{-3}\text{Wb}$. The self-inductance of the solenoid is:

In an a.c. circuit the e.m.f. ($e$) and the current ($i$) at any instant are given respectively by $e=E_0\sin \omega t$ and $i=I_0\sin (\omega t-\pi /2)$. The average power in the circuit over one cycle of a.c. is:

In the phenomenon of electric discharge through gases at low pressure, the coloured glow in the tube appears as a result of: