1
JEE Main 2023 (Online) 25th January Evening Shift
Numerical
+4
-1

Two cells are connected between points A and B as shown. Cell 1 has emf of 12 V and internal resistance of 3$$\Omega$$. Cell 2 has emf of 6V and internal resistance of 6$$\Omega$$. An external resistor R of 4$$\Omega$$ is connected across A and B. The current flowing through R will be ____________ A.

2
JEE Main 2023 (Online) 25th January Morning Shift
Numerical
+4
-1

In the given circuit, the equivalent resistance between the terminal A and B is __________ $$\Omega$$.

3
JEE Main 2023 (Online) 24th January Evening Shift
Numerical
+4
-1

If a copper wire is stretched to increase its length by 20%. The percentage increase in resistance of the wire is __________%.

4
JEE Main 2023 (Online) 24th January Morning Shift
Numerical
+4
-1

A hollow cylindrical conductor has length of 3.14 m, while its inner and outer diameters are 4 mm and 8 mm respectively. The resistance of the conductor is $$n\times10^{-3}\Omega$$. If the resistivity of the material is $$\mathrm{2.4\times10^{-8}\Omega m}$$. The value of $$n$$ is ___________.