Current Electricity

In the network shown cell E has internal resistance $r$ and the galvanometer shows zero deflection. If the cell is replaced by a new cell of emf $2 E$ and internal resistance $3 r$ keeping everything else identical, then

A potentiometer wire has length $L$ For given cell of emf $E$, the balancing length is $\frac{L}{3}$ from the positive end of the wire. If the length of potentiometer wire is increased by $50 \%$, then for the same cell, the balance point i...

In moving coil galvanometer, strong horse shoe magnet of concave shaped pole pieces is used to

A galvanometer has resistance of $100 \Omega$ and a current of 10 mA produces full scale deflection in it. The resistance to be connected in series, to get a voltmeter of range 50 volt is

The circuit in 1\(\Omega\) resistor in the following circuit is

For a metallic wire, the ratio of voltage to corresponding current is

With a resistance of ' $X$ ' in the left gap and resistance of $9 \Omega$ in the right gap of a meter bridge, the balance point is obtained at 40 cm from the left end.
In what way and to which resistance $3 \Omega$ resistance be connected t...

In the given electrical circuit, which one of the following equations is a correct equation?

The range of an ammeter of resistance ' $G$ can be increased from ' $I$ ' to ' $nI$ ' by connecting