Electromagnetic Induction — Physics STD 12 Science — Question

What is called equipotential surface?Draw the diagram of equipotential surface due point positive charge.

Out of the following, which radiation has least frequency?Gamma rays, Infrared rays, X-rays, Blue light.

In what way is the behaviour of a diamagnetic material different from that of a  paramagnetic, when kept in an external magnetic field.

Ultraviolet radiations of different frequencies and are incident on two photosensitive materials having work functions W₁ and W₂ (W₁>W₂) respectively. The kinetic energy of the emitt3ed electrons is same in both the cases. Which one of the two radiations will be of higher frequency?

A ferry boat loaded with rocks has to pass under a bridge. The maximum height of the rocks is slightly more than the height of the bridge so that the boat just fails to pass under the bridge. Should some of the rocks be removed or some more rocks be added?

Volt-second is unit of which physical quantity?

Write any one equation representing nuclear fusion reaction.

Name the physical quantity whose S.I. unit is JC^–1. Is it a scalar or a vector quantity?

A cube of iron (density = 8000kg m^-3, specific heat capacity = 470J kg^-1 K^-1) is heated to a high temperature and is placed on a large block of ice at 0°C. The cube melts the ice below it, displaces the water and sinks. In the final equilibrium position, its upper surface just goes inside the ice. Calculate the initial temperature of the cube. Neglect any loss of heat outside the ice and the cube. The density of ice = 900kg m^-3 and the latent heat of fusion of ice = 3.36 × 10⁵J kg^-1.