Ohm's Law

A wire of  $15\mathrm{\Omega }$ resistance is gradually stretched to double its original length. It is then cut into two equal parts. These parts are then connected in parallel across a $3.0 \mathrm{V}$ battery. Find the current drawn from the battery.

In the circuit shown reading of the ideal voltmeter used is equal to _____ volts.

The reading of the ammeter in the following figure will be

Find current given by battery:

Two plates, one at $300 \mathrm{V}$, other at $-100 \mathrm{V}$ are $4 \mathrm{cm}$ apart. The voltage at $3 \mathrm{cm}$ from the second plate is:

In the circuit diagram shown below, $V_A$ and $V_B$ are the potentials at points $A$ and $B$ respectively. Then. $V_A-V_B$ is

The terminal potential difference across $A$ and $B$ in the circuit shown is

In the electrical network shown in the figure, the potential difference across $3 \mathrm{\Omega }$ resistance will be

A cell of emf $E$ having an internal resistance $r$ is connected to an external resistance $R$. The potential difference $V$ across the resistance $R$ varies with $R$ as shown by the curve,

In the shown circuit, what is the potential difference across $A$ and $B$?

In the figure the potential difference across $6 \mathrm{ohm}$ resistor is $48 \mathrm{V}$. Then the potential difference between $A$ and $B$ is

In the given transistor circuit, the base current is $35 \mathrm{mA}$. The value of $R_{\mathrm{b}}$ is (${\mathrm{V}}_{\mathrm{BE}}$, is assumed to be negligible)

In the $LCR$ circuit shown in figure. Pick up the wrong statement?

A light emitting diode(LED) has a voltage drop of $2V$ across it and passes a current of $10 \mathrm{mA}$. When it operates with a $6 \mathrm{V}$ battery through a limiting resistor $R$, the value of $R$ is

In the given circuit ammeter and voltmeter are ideal and battery of $6 \mathrm{V}$ has internal resistance $1 \mathrm{\Omega }$. The reading of voltmeter and ammeter is

A resistance of frustum shape is shown in figure. If a current $i$ passes through the resistance, the electric field at $A$ and $B$ are related as

On closing the key, charge will flow from

Following figure shows cross-sections through three long conductors of the same length and material, with square cross-section of edge lengths as shown. Conductor $B$ will fit snugly within conductor $A$, and conductor $C$ will fit snugly within conductor $B$. Relationship between their end to end resistance is :-

In the circuit given below, the reading of the ammeter and voltmeter are :-

In the shown circuit, when the voltage between $A$ and $B$ is $16 \mathrm{V}$ the voltage between $C$ and $D$ is $8 \mathrm{V}.$ When the voltage between $C$ and $D$ is $15 \mathrm{V}$ what is the voltage (in $\mathrm{V}$ ) between $A$ and$B$ ?