1
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 11th January Evening Slot

A paramagnetic substance in the form of a cube with sides 1 cm has a magnetic dipole moment of 20 $$ \times $$ 10–6 J/ T when a magnetic intensity of 60 $$ \times $$ 103 A/m is applied. Its magnetic susceptibility is
A
3.3 $$ \times $$ 10–4
B
2.3 $$ \times $$ 10–2
C
4.3 $$ \times $$ 10–2
D
3.3 $$ \times $$ 10–2

Explanation

x = $${1 \over H}$$

I = $${{Magnetic\,moment} \over {Volume}}$$

I = $${{20 \times {{10}^{ - 6}}} \over {{{10}^{ - 6}}}}$$ = 20 N/m2

x = $${{20} \over {60 \times {{10}^{ + 3}}}}$$ = $${1 \over 3} \times {10^{ - 3}}$$

= 0.33 $$ \times $$ 10$$-$$3 = 3.3 $$ \times $$ 10$$-$$4
2
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 12th January Evening Slot

A 10 m long horizontal wire extends from North East to South West. It is falling with a speed of 5.0 ms–1, at right angles to the horizontal component of the earth's magnetic field of 0.3 $$ \times $$ 10–4 Wb/m2. The value of the induced emf in wire is :
A
0.3 $$ \times $$ 10–3 V
B
2.5 $$ \times $$ 10–3 V
C
1.5 $$ \times $$ 10–3 V
D
1.1 $$ \times $$ 10–3 V

Explanation

Induied emf = Bv$$\ell $$ sin 45o

= 0.3 $$ \times $$ 10$$-$$4 $$ \times $$ 5 $$ \times $$ 10 $$ \times $$ sin 45o

= 1.1 $$ \times $$ 10$$-$$3 V
3
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 12th January Evening Slot

A paramagnetic material has 1028 atoms/m3. Its magnetic susceptibility at temperature 350 K is 2.8 $$ \times $$ 10–4. Its susceptibility at 300 K is :
A
3.726 $$ \times $$ 10–4
B
2.672 $$ \times $$ 10–4
C
3.672 $$ \times $$ 10–4
D
3.267 $$ \times $$ 10$$-$$4

Explanation

x $$\alpha $$ $${1 \over {{T_C}}}$$

curie law for paramagnetic substane

$${{{x_1}} \over {{x_2}}}$$ = $${{{T_{{C_2}}}} \over {{T_{{C_1}}}}}$$

$${{2.8 \times {{10}^{ - 4}}} \over {{x_2}}} = {{300} \over {350}}$$

x2 = $${{2.8 \times 350 \times {{10}^{ - 4}}} \over {300}}$$

= 3.266 $$ \times $$ 10$$-$$4
4
MCQ (Single Correct Answer)

JEE Main 2019 (Online) 9th April Morning Slot

The total number of turns and cross-section area in a solenoid is fixed. However, its length L is varied by adjusting the separation between windings. The inductance of solenoid will be proportional to :
A
1/L2
B
1/L
C
L
D
L2

Explanation

$$\phi $$ = NBA = LI

N $$\mu $$0 nI$$\pi $$R2 = LI

$$N{\mu _0}{N \over l}l\pi {R^2} = LI$$

N and R constant

Self inductance (L) $$ \propto {1 \over l} \propto {1 \over {length}}$$

Questions Asked from Alternating Current and Electromagnetic Induction

On those following papers in MCQ (Single Correct Answer)
Number in Brackets after Paper Name Indicates No of Questions
AIEEE 2002 (5)
keyboard_arrow_right
AIEEE 2003 (4)
keyboard_arrow_right
AIEEE 2004 (6)
keyboard_arrow_right
AIEEE 2005 (5)
keyboard_arrow_right
AIEEE 2006 (6)
keyboard_arrow_right
AIEEE 2007 (2)
keyboard_arrow_right
AIEEE 2008 (1)
keyboard_arrow_right
AIEEE 2009 (1)
keyboard_arrow_right
AIEEE 2010 (3)
keyboard_arrow_right
AIEEE 2011 (3)
keyboard_arrow_right
AIEEE 2012 (1)
keyboard_arrow_right
JEE Main 2013 (Offline) (4)
keyboard_arrow_right
JEE Main 2014 (Offline) (3)
keyboard_arrow_right
JEE Main 2015 (Offline) (5)
keyboard_arrow_right
JEE Main 2016 (Online) 9th April Morning Slot (2)
keyboard_arrow_right
JEE Main 2016 (Online) 10th April Morning Slot (2)
keyboard_arrow_right
JEE Main 2016 (Offline) (1)
keyboard_arrow_right
JEE Main 2017 (Offline) (1)
keyboard_arrow_right
JEE Main 2017 (Online) 8th April Morning Slot (1)
keyboard_arrow_right
JEE Main 2017 (Online) 9th April Morning Slot (2)
keyboard_arrow_right
JEE Main 2018 (Offline) (3)
keyboard_arrow_right
JEE Main 2018 (Online) 15th April Morning Slot (2)
keyboard_arrow_right
JEE Main 2018 (Online) 15th April Evening Slot (3)
keyboard_arrow_right
JEE Main 2018 (Online) 16th April Morning Slot (3)
keyboard_arrow_right
JEE Main 2019 (Online) 9th January Evening Slot (1)
keyboard_arrow_right
JEE Main 2019 (Online) 10th January Morning Slot (1)
keyboard_arrow_right
JEE Main 2019 (Online) 10th January Evening Slot (2)
keyboard_arrow_right
JEE Main 2019 (Online) 11th January Morning Slot (1)
keyboard_arrow_right
JEE Main 2019 (Online) 11th January Evening Slot (2)
keyboard_arrow_right
JEE Main 2019 (Online) 12th January Evening Slot (2)
keyboard_arrow_right
JEE Main 2019 (Online) 9th April Morning Slot (1)
keyboard_arrow_right
JEE Main 2019 (Online) 10th April Morning Slot (1)
keyboard_arrow_right
JEE Main 2019 (Online) 12th April Evening Slot (1)
keyboard_arrow_right
JEE Main 2020 (Online) 7th January Morning Slot (3)
keyboard_arrow_right
JEE Main 2020 (Online) 2nd September Morning Slot (1)
keyboard_arrow_right
JEE Main 2020 (Online) 2nd September Evening Slot (2)
keyboard_arrow_right
JEE Main 2020 (Online) 3rd September Morning Slot (1)
keyboard_arrow_right
JEE Main 2020 (Online) 3rd September Evening Slot (1)
keyboard_arrow_right
JEE Main 2020 (Online) 4th September Morning Slot (1)
keyboard_arrow_right
JEE Main 2020 (Online) 4th September Evening Slot (1)
keyboard_arrow_right
JEE Main 2020 (Online) 6th September Morning Slot (1)
keyboard_arrow_right
JEE Main 2021 (Online) 24th February Evening Slot (1)
keyboard_arrow_right
JEE Main 2021 (Online) 25th February Morning Slot (2)
keyboard_arrow_right
JEE Main 2021 (Online) 25th February Evening Shift (2)
keyboard_arrow_right
JEE Main 2021 (Online) 26th February Morning Shift (1)
keyboard_arrow_right
JEE Main 2021 (Online) 26th February Evening Shift (1)
keyboard_arrow_right
JEE Main 2021 (Online) 16th March Morning Shift (1)
keyboard_arrow_right
JEE Main 2021 (Online) 16th March Evening Shift (1)
keyboard_arrow_right
JEE Main 2021 (Online) 17th March Morning Shift (1)
keyboard_arrow_right
JEE Main 2021 (Online) 17th March Evening Shift (2)
keyboard_arrow_right
JEE Main 2021 (Online) 18th March Morning Shift (2)
keyboard_arrow_right
JEE Main 2021 (Online) 18th March Evening Shift (2)
keyboard_arrow_right
JEE Main 2021 (Online) 20th July Evening Shift (1)
keyboard_arrow_right
JEE Main 2021 (Online) 22th July Evening Shift (2)
keyboard_arrow_right
JEE Main 2021 (Online) 25th July Evening Shift (1)
keyboard_arrow_right
JEE Main 2021 (Online) 27th July Morning Shift (1)
keyboard_arrow_right
JEE Main 2021 (Online) 27th July Evening Shift (1)
keyboard_arrow_right
JEE Main 2021 (Online) 26th August Morning Shift (2)
keyboard_arrow_right
JEE Main 2021 (Online) 26th August Evening Shift (1)
keyboard_arrow_right
JEE Main 2021 (Online) 27th August Morning Shift (1)
keyboard_arrow_right
JEE Main 2021 (Online) 31st August Morning Shift (2)
keyboard_arrow_right
JEE Main 2021 (Online) 31st August Evening Shift (1)
keyboard_arrow_right

EXAM MAP

Joint Entrance Examination

JEE Advanced JEE Main

Medical

NEET

Graduate Aptitude Test in Engineering

GATE CSE GATE EE GATE ECE GATE ME GATE CE GATE PI GATE IN