A plane electromagnetic wave of frequency 25 MHz travels in free space along the x-direction. At a particular point in space and time. . What is B at this point?

From molecular viewpoint, discuss the temperature dependence of susceptibility for diamagnetism, Para magnetism and ferromagnetism.

A lamp is connected in series with a capacitor. Predict your observations for dc and ac connections. What happens in each case if the capacitance of the capacitor is reduced?

Define power of a lens. Show that it is inversely proportional to the focal length of the lens.

Two slits are made one millimetre apart and the screen is placed one metre away. What is the fringe separation when blue-green light of wavelength 500 nm is used?