AIPMT NEET 2014 Mock Test

Two identical long conducting wires $AOB$ and $COD$ are placed at right angle to each other, with one above other such that '$O$ ' is their common point. The wires carry $I_1$ and $I_2$ currents, respectively. Point '$P$ ' is lying at distance '$d$ ' from '$O$ ' along a direction perpendicular to the plane containing the wires. The magnetic field at point '$P$ ' will be:

A thin semicircular conducting ring ($PQR$) of radius '$r$ ' is falling with its plane vertical in a horizontal magnetic field $B$. The potential difference developed across the ring when its speed is $v$, is:

A transformer having efficiency of $90\%$ is working on $200\text{V}$ and $3\text{kW}$ power supply. If the current in the secondary coil is $6\text{A}$, the voltage across the secondary coil and the current in the primary coil respectively are:

Light with an energy flux of $25\times 10^4{\text{Wm}}^{-2}$ falls on a perfectly reflecting surface at normal incidence. If the surface area is $15{\text{cm}}^2$, the average force exerted on the surface is:

A beam of light of $\lambda =600\text{nm}$ from a distant source falls on a single slit $1\text{mm}$ wide and the resulting diffraction pattern is observed on a screen $2\text{m}$ away. The distance between first dark fringes on either side of the central bright fringe is: