1
JEE Main 2022 (Online) 25th July Morning Shift
+4
-1 Which of the following physical quantities have the same dimensions?

A
Electric displacement $$(\overrightarrow{\mathrm{D}})$$ and surface charge density
B
Displacement current and electric field
C
Current density and surface charge density
D
Electric potential and energy
2
JEE Main 2022 (Online) 30th June Morning Shift
+4
-1

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 :

A
9 $$\Omega$$
B
18 $$\Omega$$
C
28 $$\Omega$$
D
126 $$\Omega$$
3
JEE Main 2022 (Online) 29th June Evening Shift
+4
-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

A
2$$\Omega$$
B
4$$\Omega$$
C
6$$\Omega$$
D
8$$\Omega$$
4
JEE Main 2022 (Online) 28th June Evening Shift
+4
-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 :

A
0.033 $$^\circ$$C$$-$$1
B
$$-$$0.033 $$^\circ$$C$$-$$1
C
0.011 $$^\circ$$C$$-$$1
D
0.055 $$^\circ$$C$$-$$1
JEE Main Subjects
Physics
Mechanics
Electricity
Optics
Modern Physics
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Physical Chemistry
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