Current Electricity

In the given circuit, it is observedthat the current $I$ is independent of the value of resistance $R_{5}$. Then, the resistance value must satisfy

Determine the current in $2 \Omega$ resistor?

In the circuit shown in the figure, find the current in $45 \Omega$.

A conducting wire is stretched by applying a deforming force, so that its diameter decreases to $40 \%$ of original value. The percentage change in its resistance will be

A wire of resistance $160 \Omega$ is melted and drawn in wire of one-fourth of its length. The new resistance of the wire will be

Five cells each of emf $E$ and internal resistance $r$ send the same amount of current through an external resistance $R$ whether the cells are connected in parallel or in series. Then the ratio…

Ratio of thermal energy released in two resistor $R$ and $3 R$ connected in parallel in an electric circuit is :

An electric current $I$ enters and leaves a uniform circular wire of radius $r$ through diametrically opposite points. A charged particle $q$ moves along the axis of circular wire passes through its centre at speed $v$.…

A moving coil galvanometer has resistance of $10 \Omega$ and full scale deflection of $0.01 \mathrm{~A}$. It can be converted into voltmeter of $10 \mathrm{~V}$ full scale by connecting into resistance of

A wire of a certain material is stretched slowly by ten per cent. Its new resistance and specific resistance become respectively:

Two wires $\mathrm{A}$ and $\mathrm{B}$ of the same material, having radii in the ratio 1: 2 and carry currents in the ratio 4: 1 . The ratio of drift speed of electrons in $\mathrm{A}$ and $\mathrm{B}$ is

A carbon resistor of $(56±5\cdot 6) kΩ$ is to be marked with rings of different colours for its identification. The colour code sequence will be