Superconductors are

What is a superconductor?

The resistance of rheostat shown in the figure is $0-30 \mathrm{\Omega }$, Neglecting the resistance of ammeter and connecting wire the minimum and maximum currents through the ammeter will be

In the given circuit the voltmeter reads 5V. The resistance of the voltmeter in Ohm is.

For a cell, a graph is plotted between the potential difference $V$ across the terminals of the cell and current $I$ drawn from the cell (see fig.) The emf and internal resistance of the cell are $E$ and $r$ respectively, then :

Which of the units given below is the SI unit of resistance?

Consider an infinite grid with square cells. The resistance between two adjacent joints is $R.$ Find the net resistance $R_{net}$ of the whole grid between two points A & B.

$\mathrm{V}-\mathrm{I}$ graph for parallel and series combinations for two identical resistors are as shown in figure.Which graph represents parallel combination?

The potential difference between the two ends of a conductor is $V$, and the current flowing through the conductor is $I$. At a constant temperature, which of the following statement is true for the conductor?

Following figures shows graph of $I-V$. Which graph is correct according to Ohm's law?