Questions in Current Electricity

Select	Question
	A potentiometer is an ideal device of measuring potential difference because
	A battery of 6 volts is connected to the terminals of a three metre long wire of uniform thickness and resistance of the order of 100$\Omega $. The difference of potential between two points separated by 50$cm$ on the wire will be
	A galvanometer of 10 ohm resistance gives full scale deflection with 0.01 ampere of current. It is to be converted into an ammeter for measuring 10 ampere current. The value of shunt resistance required will be
	A potentiometer is used for the comparison of e.m.f. of two cells ${E_1}$ and ${E_2}$. For cell ${E_1}$ the no deflection point is obtained at 20$cm$ and for ${E_2}$ the no deflection point is obtained at 30$cm$. The ratio of their e.m.f.'s will be
	Potential gradient is defined as
	In an experiment of meter bridge, a null point is obtained at the centre of the bridge wire. When a resistance of 10 ohm is connected in one gap, the value of resistance in other gap is
	If the length of potentiometer wire is increased, then the length of the previously obtained balance point will
	In potentiometer a balance point is obtained, when
	In the experiment of potentiometer, at balance, there is no current in the
	If in the experiment of Wheatstone's bridge, the positions of cells and galvanometer are interchanged, then balance points will