A particle acted on by constant forces 

The total work done by the forces is

The figure shows three spherical and equipotential surfaces A, B and C around a point charge q. The potential difference V_A - V_B = V_B - V_C. If t₁ and t₂ are the distances between them, then

The resistance of bulb filament is 100W at a temperature of 100°C. If its temperature coefficient of resistance is 0.005 per °C, its resistance will become 200 W at a temperature (°C) of _____.

A particle moves towards east from a point A to a point B at the rate of 4 km/h and then towards north from B to C at rate of 5 km/h. If AB = 12 km and BC = 5 km, then its average speed for its journey from A to C and resultant average velocity direct from A to C respectively are

The difference in the variation of resistance with temperature in a metal and a semiconductor arises essentially due to the difference in the

Which of the following is used for making the filaments of electric bulbs?

An alien is celebrating his 4^th birthday on his home planet, which is at a distance of 4 AU from the sun. What is the age of the alien in terrestrial years?

Two batteries 8V and 4V with respective internal resistances 4Ω and 8Ω are connected in parallel as shown in the circuit. When switch S is closed, then

Assuming the sun to have a spherical outer surface of radius r, radiating like a black body at temperature toC, the power received by a unit surface, (normal to the incident rays) at a distance R from the centre of the sun is