1
AP EAPCET 2021 - 20th August Morning Shift
MCQ (Single Correct Answer)
+1
-0

The induced emf cannot be produced by

A
moving a magnet near a circuit
B
moving a circuit near a magnet
C
changing the current in one circuit placed near the other
D
maintaining large but constant current in a circuit
2
AP EAPCET 2021 - 20th August Morning Shift
MCQ (Single Correct Answer)
+1
-0

Assertion (A) When plane of coil is perpendicular to magnetic field, magnetic flux linked with the coil is minimum, but induced emf is zero.

Reason (R) $$\phi=n A B \cos \theta$$ and $$e=\frac{d \phi}{d t}$$

A
Both $$A$$ and $$R$$ are true and $$R$$ is the correct explanation for $$A$$.
B
Both $$A$$ and $$R$$ are true but $$R$$ is not the correct explanation for $$A$$.
C
$$A$$ is true, $$R$$ is false.
D
$$A$$ is false, $$R$$ is true.
3
AP EAPCET 2021 - 19th August Evening Shift
MCQ (Single Correct Answer)
+1
-0

A solenoid of length $$60 \mathrm{~cm}$$ with 15 turns per $$\mathrm{cm}$$ and area of cross-section $$4 \times 10^{-3} \mathrm{~m}^2$$ completely surrounds another co-axial solenoid of same length and area of cross-section $$2 \times 10^{-3} \mathrm{~m}^2$$ with 40 turns per $$\mathrm{cm}$$. Mutual inductance of the system is

A
9 mH
B
6 mH
C
3 mH
D
10 mH
4
AP EAPCET 2021 - 19th August Morning Shift
MCQ (Single Correct Answer)
+1
-0

An electric generator is based on

A
Faraday's laws of electromagnetic induction
B
Motion of charged particles in an electromagnetic field
C
Fission of uranium by slow neutrons
D
Newton's laws of motion
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