JEE Main 2022 (Online) 25th July Morning Shift | Current Electricity Question 117 | Physics

An electric cable of copper has just one wire of radius 9 mm. Its resistance is 14 $$\Omega$$. If this single copper wire of the cable is replaced by seven identical well insulated copper wires each of radius 3 mm connected in parallel, then the new resistance of the combination will be :

9 $$\Omega$$

18 $$\Omega$$

28 $$\Omega$$

126 $$\Omega$$

JEE Main 2022 (Online) 29th June Evening Shift

MCQ (Single Correct Answer)

-1

The combination of two identical cells, whether connected in series or parallel combination provides the same current through an external resistance of 2$$\Omega$$. The value of internal resistance of each cell is

2$$\Omega$$

4$$\Omega$$

6$$\Omega$$

8$$\Omega$$

JEE Main 2022 (Online) 28th June Evening Shift

MCQ (Single Correct Answer)

-1

Resistance of the wire is measured as 2 $$\Omega$$ and 3 $$\Omega$$ at 10$$^\circ$$C and 30$$^\circ$$C respectively. Temperature co-efficient of resistance of the material of the wire is :

0.033 $$^\circ$$C^$$-$$1

$$-$$0.033 $$^\circ$$C^$$-$$1

0.011 $$^\circ$$C^$$-$$1

0.055 $$^\circ$$C^$$-$$1

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