Current Electri...

Potentiometer measures potential more accurately because

 For driving current of $$2A$$ for $$6$$ minute in a circuit. $$1000 J$$ of work is to be done. The e.m.f. of the source in the circuit is

Which of the following devices has a source of emf inside it?

 The figure shows in apart of an electric circuit, then the current I is

A potentiometer circuit shown in the figure is set up to measure emf of cell E. As the point P moves from X to Y, the galvanometer G shows deflection always in one direction, but the deflection decreases continuously until Y is reached. The balance point between X and Y maybe obtained by

In specific resistance measurement of a wire using a meter bridge, the key k in the main circuit is kept open when we are not taking readings. The reason is

Which of the following shows energy changes that takes place when an incandescent bulb glows using a battery?

If $$i_{1}=3\sin\omega t$$ and $$i_{2}=4\cos\omega t$$, then $$i_{3}$$ is

Steady current flows in a metallic conductor of non-uniform cross-section. Which of the following quantities is a constant along the conductor ?

An electron in potentiometer wire experiences a force $$2.4\times 10^{-19}$$N. The length of potentiometer wire is $$6m$$. The e.m.f. of the battery connected across the wire is (electronic charge $$=1.6\times 10^{-19}$$C).