NEET 2015 Code A - Mock Test

A rectangular coil of length $0.12\text{m}$ and width $0.1\text{m}$ having $50$ turns of wire is suspended vertically in a uniform magnetic field of strength $0.2{\text{Weber/m}}^2$. The coil carries a current of $2\text{A}$. If the plane of the coil is inclined at an angle of $30^{\circ }$ with the direction of the field, the torque required to keep the coil in stable equilibrium will be:

A parallel plate air capacitor has capacity $C$, distance of separation between plates is $d$ and potential difference $V$ is applied between the plates. Force of attraction between the plates of the parallel plate air capacitor is:

Two vessels separately contain two ideal gases $A$ and $B$ at the same temperature, the pressure of $A$ being twice that of $B$. Under such conditions, the density of $A$ is found to be $1.5$ times the density of $B$. The ratio of molecular weight of $A$ and $B$ is:

A satellite $S$ is moving in an elliptical orbit around the earth. The mass of the satellite is very small compared to the mass of the earth. Then:

In the given figure, a diode $D$ is connected to an external resistance $R=100\Omega$ and an e.m.f. of $3.5\text{V}$. If the barrier potential developed across the diode is $0.5\text{V}$, the current in the circuit will be: