1
JEE Main 2024 (Online) 5th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Two conducting circular loops A and B are placed in the same plane with their centres coinciding as shown in figure. The mutual inductance between them is:

JEE Main 2024 (Online) 5th April Morning Shift Physics - Electromagnetic Induction Question 3 English

A
$$\frac{\mu_o}{2 \pi} \cdot \frac{b^2}{a}$$
B
$$\frac{\mu_{\mathrm{o}} \pi \mathrm{a}^2}{2 \mathrm{~b}}$$
C
$$\frac{\mu_0 \pi b^2}{2 a}$$
D
$$\frac{\mu_0}{2 \pi} \cdot \frac{a^2}{b}$$
2
JEE Main 2024 (Online) 1st February Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
A transformer has an efficiency of $80 \%$ and works at $10 \mathrm{~V}$ and $4 \mathrm{~kW}$. If the secondary voltage is $240 \mathrm{~V}$, then the current in the secondary coil is :
A
$1.33 \mathrm{~A}$
B
$13.33 \mathrm{~A}$
C
$1.59 \mathrm{~A}$
D
$15.1 \mathrm{~A}$
3
JEE Main 2024 (Online) 31st January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

A coil is places perpendicular to a magnetic field of $$5000 \mathrm{~T}$$. When the field is changed to $$3000 \mathrm{~T}$$ in $$2 \mathrm{~s}$$, an induced emf of $$22 \mathrm{~V}$$ is produced in the coil. If the diameter of the coil is $$0.02 \mathrm{~m}$$, then the number of turns in the coil is:

A
35
B
70
C
7
D
140
4
JEE Main 2024 (Online) 30th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Match List I with List II

List I List II
(A) Gauss's law of magnetostatics (I) $$\oint \vec{E} \cdot \vec{d} a=\frac{1}{\varepsilon_0} \int \rho d V$$
(B) Faraday's law of electro magnetic induction (II) $$\oint \vec{B} \cdot \vec{d} a=0$$
(C) Ampere's law (III) $$\int \vec{E} \cdot \vec{d} l=\frac{-d}{d t} \int \vec{B} \cdot \vec{d} a$$
(D) Gauss's law of electrostatics (IV) $$\oint \vec{B} \cdot \vec{d} l=\mu_0 I$$

Choose the correct answer from the options given below:

A
A-III, B-IV, C-I, D-II
B
A-IV, B-II, C-III, D-I
C
A-II, B-III, C-IV, D-I
D
A-I, B-III, C-IV, D-II
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