Physics Test - ...

A magnet of dipole moment \(2 A m^{2}\) is deflected through \(30^{\circ}\) from magnetic meridian. The required deflecting torque is \(\left(B_{H}=0.4 \times 10^{-4} T\right)\):

The angular momentum of a particle performing uniform circular motion is L. If the kinetic energy of the particle is doubled and frequency is halved, then angular momentum becomes:

An electron and a proton are allowed to fall through the separation between the plates of a parallel plate capacitor of voltage \(5 \mathrm{~V}\) and separation distance \(\mathrm{h}=1 \mathrm{~mm}\). Calculate the time of flight for both electron and proton:

If the stone is thrown up vertically and return to ground, its potential energy is maximum:

What happens when a body is moving in a circular path with a constant speed?

Two wires \(A\) and \(B\) are stretched by the same load. If the area of crosssection of wire ' \(A\) ' is double that of ' \(B\) ', then the stress on ' \(B\) ' is:

In a transistor the collector current is always less than the emitter current because:

A long insulated copper wire is closely wound as a spiral of 'N' turns. The spiral has an inner radius 'a' and an outer radius 'b'. The spiral lies in the X-Y plane and a steady current 'I' flows through the wire. The Z-component of the magnetic field at the center of the spiral is:

Focal length of the plano-convex lens is when________its radius of curvature of the surface is \({R}\) and \({n}\) is the refractive index of the lens