1
AP EAPCET 2022 - 4th July Evening Shift
+1
-0

A circular coil has 100 turns, radius 3 cm and resistance $$4 \Omega$$. This coil is co-axial with a solenoid of 200 turns/$$\mathrm{cm}$$ and diameter 4 cm . If the solenoid current is decreased from 2 A to zero in 0.04 s , then the current induced in the coil is

A
$$4 \pi^2 \mathrm{~mA}$$
B
$$8 \pi \mathrm{mA}$$
C
30.3 mA
D
45.5 mA
2
AP EAPCET 2021 - 20th August Morning Shift
+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
3
AP EAPCET 2021 - 20th August Morning Shift
+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.
4
AP EAPCET 2021 - 19th August Evening Shift
+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
EXAM MAP
Medical
NEET