1
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

The current in a coil changes steadily from $$3 \mathrm{~A}$$ to $$5 \mathrm{~A}$$ in $$0.2 \mathrm{~s}$$ when an emf of $$2 \mu \mathrm{V}$$ is induced in it. The self-inductance of the coil is

A
0.2 mH
B
20 $$\mu H$$
C
2 $$\mu H$$
D
0.2 $$\mu H$$
2
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

The magnetic flux linked with a coil is given by the equation: $$\phi=8 t^2+t+10$$. The e.m.f. induced in the coil in the $$3^{\text {rd }}$$ second will be

A
49 V
B
33 V
C
16 V
D
20 V
3
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Select the unit of the coefficient of mutual induction from the following.

A
volt. second / ampere
B
weber. ampere
C
ampere / weber
D
volt. ampere / second
4
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Around the central part of an air cored solenoid of length $$20 \mathrm{~cm}$$ and area of cross section $$1.4 \times 10^{-3} \mathrm{~m}^2$$ and 3000 turns, another coil of 250 turns is closely wound. A current $$2 \mathrm{~A}$$ in the solenoid is reversed in $$0.2 \mathrm{~s}$$, then the induced emf produced is

A
$$1.32 \times 10^{-1} \mathrm{~V}$$
B
$$4 \times 10^{-1} \mathrm{~V}$$
C
$$1.16 \times 10^{-1} \mathrm{~V}$$
D
$$8 \times 10^{-2} \mathrm{~V}$$
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