A bar magnet Is allowed to fall freely through a solenoid whose ends are connected to each other. Does its acceleration Is less than g ? Justify your answer.

A beam of light passing from one transparent medium to another obliquely, undergoes an abrupt change in direction. This phenomenon is known as refraction of light.Using the figure obtained in (b), show that the incident ray and the emergent ray are parallel to each other. Redraw the same figure, if the light is entering from a medium denser than glass. Justify your answer

Two charged conducting spheres of radii a and b are connected to each other by a wire. What is the ratio of electric fields at the surfaces of the two spheres? Use the result obtained to explain why charge density on the sharp and pointed ends of a conductor is higher than on its flatten portions.

When a capillary tube of radius r is dipped in water, the water rises through it up to a height h. If the length of the tube is less than the length of the capillary rise will it overflow? Justify your answer.