An electric heater takes 4A when operated on a 250V supply. What is the cost of the electricity consumed at 10k per kWh when the heater is used for 5 hours?

In an operating X-ray tube, a high p.d is applied between the cathode and the anode for the purpose of

An object 8cm in front of a plane mirror moves at a speed of 6cm s-1 away from the mirror. What will be the distance separating the object and the image afte...

In the normal use of a simple microscope, a person sees an

Which colour is deviated least when white light passes through a triangular prism?

The energy stored in a capacitor of capacitance 5 μF is 40J. What is the voltage applied across its terminals?

Which is a fundamental unit?

The ability of the eye to focus on objects at various distances is known as

Which device does NOT make use of the magnetic effects of an electric current?