1
AP EAPCET 2022 - 4th July Evening Shift
MCQ (Single Correct Answer)
+1
-0

A toroid has a non ferromagnetic core of inner radius 24 cm and outer radius 25 cm , around which 4900 turns of a wire are wound. If the current in the wire is 12 A , the magnetic field inside the core of the toroid is

A
56 mT
B
54 mT
C
42 mT
D
48 mT
2
AP EAPCET 2022 - 4th July Evening Shift
MCQ (Single Correct Answer)
+1
-0

A steel wire of length $$l$$ and magnetic moment $$M$$ is bent into a semicircular arc of radius $$R$$. The new magnetic moment is

A
$$M$$
B
$$\frac{2 R M}{\pi l}$$
C
$$\frac{2 M}{\pi}$$
D
$$\frac{2 \pi R M}{1}$$
3
AP EAPCET 2022 - 4th July Evening Shift
MCQ (Single Correct Answer)
+1
-0

A magnetic needle free to rotate in a vertical plane parallel to the magnetic meridian has its north tip pointing down at $$30^{\circ}$$ with the horizontal. The horizontal component of the earth's magnetic field at the place is 0.3 G . Then the magnitude of the earth's magnetic field at the location is

A
$$\frac{\sqrt{3}}{5} G$$
B
$$\sqrt{3} \mathrm{G}$$
C
$$\frac{20}{\sqrt{3}} \mathrm{G}$$
D
$$\frac{2}{\sqrt{3}} \mathrm{G}$$
4
AP EAPCET 2022 - 4th July Evening Shift
MCQ (Single Correct Answer)
+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
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