A radio is operated by eight cells each of e.m.f. 2.0V connected in series. If two of the cells are wrongly connected, the net e.m.f. of the radio is

If a charged ion goes through combined electric and magnetic fields, the resultant emergent velocity of the ion is

A projection lantern is used to give the image of a slide on a screen. If the image is 24 times as large as the slide and the screen is 72.0m from the projecting lens, what is the position of the slide from the lens?

A cell of internal resistance 0.01Ω can be measured accurately using the