1
JEE Main 2022 (Online) 25th June Evening Shift
+4
-1

Given below are two statements :

Statement I : Susceptibilities of paramagnetic and ferromagnetic substances increase with decrease in temperature.

Statement II : Diamagnetism is a result of orbital motions of electrons developing magnetic moments opposite to the applied magnetic field.

Choose the correct answer from the options given below :

A
Both Statement I and Statement II are true.
B
Both Statement I and Statement II are false.
C
Statement I is true but Statement II is false.
D
Statement I is false but Statement II is true.
2
JEE Main 2022 (Online) 25th June Evening Shift
+4
-1

A long solenoid carrying a current produces a magnetic field B along its axis. If the current is doubled and the number of turns per cm is halved, the new value of magnetic field will be equal to

A
B
B
2B
C
4B
D
$${B \over 2}$$
3
JEE Main 2022 (Online) 25th June Morning Shift
+4
-1

A long straight wire with a circular cross-section having radius R, is carrying a steady current I. The current I is uniformly distributed across this cross-section. Then the variation of magnetic field due to current I with distance r (r < R) from its centre will be :

A
B $$\propto$$ r2
B
B $$\propto$$ r
C
B $$\propto$$ $${1 \over {{r^2}}}$$
D
B $$\propto$$ $${1 \over {{r}}}$$
4
JEE Main 2022 (Online) 24th June Evening Shift
+4
-1

The soft-iron is a suitable material for making an electromagnet. This is because soft-iron has

A
low coercivity and high retentivity.
B
low coercivity and low permeability.
C
high permeability and low retentivity.
D
high permeability and high retentivity.
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Physics
Mechanics
Electricity
Optics
Modern Physics
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Inorganic Chemistry
Organic Chemistry
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