1
JEE Main 2022 (Online) 25th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Match List-I with List-II.

List - I List -II
(A) AC generator (I) Detects the presence of current in the circuit
(B) Galvanometer (II) Converts mechanical energy into electrical energy
(C) Transformer (III) Works on the principle of resonance in AC circuit
(D) Metal detector (IV) Changes an alternating voltage for smaller or greater value

Choose the correct answer from the options given below :

A
(A) - (II), (B) - (I), (C) - (IV), (D) - (III)
B
(A) - (II), (B) - (I), (C) - (III), (D) - (IV)
C
(A) - (III), (B) - (IV), (C) - (II), (D) - (I)
D
(A) - (III), (B) - (I), (C) - (II), (D) - (IV)
2
JEE Main 2022 (Online) 25th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

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 $$\propto$$ $${1 \over {{r}}}$$
3
JEE Main 2022 (Online) 25th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

If wattless current flows in the AC circuit, then the circuit is :

A
Purely Resistive circuit
B
Purely Inductive circuit
C
LCR series circuit
D
RC series circuit only
4
JEE Main 2022 (Online) 25th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The electric field in an electromagnetic wave is given by E = 56.5 sin $$\omega$$(t $$-$$ x/c) NC$$-$$1. Find the intensity of the wave if it is propagating along x-axis in the free space.

(Given : $$\varepsilon $$0 = 8.85 $$\times$$ 10$$-$$12C2N$$-$$1m$$-$$2)

A
5.65 Wm$$-$$2
B
4.24 Wm$$-$$2
C
1.9 $$\times$$ 10$$-$$7 Wm$$-$$2
D
56.5 Wm$$-$$2
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