AIPMT 2008 Main Mock Test

A thin conducting ring of radius $R$ is given a charge $+Q$. The electric field at the centre $O$ of the ring due to the charge on the part $AKB$ of the ring is $E$. The electric field at the centre due to the charge on the part $ACDB$ of the ring is:

The electric potential at a point in free space due to a charge $Q$ coulomb is $Q\times 10^{11}$ volts. The electric field at that point is:

A cell can be balanced against $110\text{cm}$ and $100\text{cm}$ of potentiometer wire, respectively with and without being short circuited through a resistance of $10\Omega$. Its internal resistance is:

A wire of a certain material is stretched slowly by ten per cent. Its new resistance and specific resistance become respectively:

In a circuit, the current through a $4\Omega$ resistor is $1\text{A}$ when the points $P$ and $M$ are connected to a d.c. voltage source. The potential difference between the points $M$ and $N$ is: