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

As shown in the schematic below, a rod of uniform cross-sectional area $A$ and length $l$ is carrying a constant current $i$ through it and voltage across the rod is measured using an ideal voltmeter. The rod is stretched by the application of a force $F$.

Which of the following graphs would show the variation in the voltage across the rod as function of the strain $\epsilon$ when the strain is small. Neglect Joule heating.

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

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 following diagram current in the $5\mathrm{\Omega }$ resistor is (when the internal resistance of the battery is zero) :-

The voltage current graph of conductor at two different temperature are shown in the Figure. If the resistances corresponding to these temperatures are $R_1$ and $R_2$ then which of the following statements is true.

A $6 \mathrm{V}$ battery is connected to the terminals of a $3 \mathrm{m}$ long wire of uniform thickness and resistance of $100 \mathrm{\Omega }.$ The difference of potential between two points on the wire separated by a distance of $50 \mathrm{cm}$ will be

For a cell, the terminal potential difference is $2.2 \mathrm{V}$ when circuit is open and reduces to $1.8 \mathrm{V}$ when cell is connected to a resistance $R=5 \mathrm{\Omega }$. The internal resistance $\left(r\right)$ of the cell is

Adjoining diagram is a part of a circuit, find the potential difference between point $A$ and point $B$.

Copper and iron wires of same length and radius are connected in series to a battery. The resistivity of copper is about one-sixth of the iron. If $E_1$ and $E_2$ are the electric fields in the copper and iron wires respectively, then which of the following is correct?