1
NEET 2024 (Re-Examination)
MCQ (Single Correct Answer)
+4
-1

Let us consider two solenoids $$A$$ and $$B$$, made from same magnetic material of relative permeability $$\mu_r$$ and equal area of cross-section. Length of $$A$$ is twice that of $$B$$ and the number of turns per unit length in $$A$$ is half that of $$B$$. The ratio of self inductances of the two solenoids, $$L_A: L_B$$ is

A
$$1: 2$$
B
$$2: 1$$
C
$$8: 1$$
D
$$1: 8$$
2
NEET 2023 Manipur
MCQ (Single Correct Answer)
+4
-1

An emf is generated by an ac generator having 100 turn coil, of loop area $$1 \mathrm{~m}^2$$. The coil rotates at a speed of one revolution per second and placed in a uniform magnetic field of $$0.05 \mathrm{~T}$$ perpendicular to the axis of rotation of the coil. The maximum value of emf is :-

A
3.14 V
B
31.4 V
C
62.8 V
D
6.28 V
3
NEET 2023
MCQ (Single Correct Answer)
+4
-1

The net magnetic flux through any closed surface is :

A
Positive
B
Infinity
C
Negative
D
Zero
4
NEET 2022 Phase 2
MCQ (Single Correct Answer)
+4
-1

The magnetic flux linked to a circular coil of radius R is

$$\phi = 2{t^3} + 4{t^2} + 2t + 5$$ Wb

The magnitude of induced emf in the coil at t = 5 s is

A
192 V
B
108 V
C
197 V
D
150 V
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