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1
JEE Main 2024 (Online) 1st February Evening Shift
MCQ (Single Correct Answer)
+4
-1
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 :
2
JEE Main 2024 (Online) 31st January Morning Shift
MCQ (Single Correct Answer)
+4
-1
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:
3
JEE Main 2024 (Online) 30th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
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:
4
JEE Main 2024 (Online) 29th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Match List I with List II
| List - I | List - II | ||
|---|---|---|---|
| (A) | $$\oint \vec{B} \cdot \overrightarrow{d l}=\mu_o i_c+\mu_o \varepsilon_o \frac{d \phi_E}{d t}$$ | (I) | Gauss' law for electricity |
| (B) | $$\oint \vec{E} \cdot \overrightarrow{d l}=\frac{d \phi_B}{d t}$$ | (II) | Gauss' law for magnetism |
| (C) | $$\oint \vec{E} \cdot \overrightarrow{d A}=\frac{Q}{\varepsilon_o}$$ | (III) | Faraday law |
| (D) | $$\oint \vec{B} \cdot \overrightarrow{d A}=0$$ | (IV) | Ampere - Maxwell law |
Choose the correct answer from the options given below:
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