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

The electrons take $$40 \times 10^3$$ s to dirift from one end of a metal wire of length 2 m to its other end. The area of cross-section of the wire is $$4 \mathrm{~mm}^2$$ and it is carrying a current of 1.6 A. The number density of free electrons in the metal wire is

A
$$8 \times 10^{28} \mathrm{~m}^{-3}$$
B
$$6 \times 10^{28} \mathrm{~m}^{-3}$$
C
$$4 \times 10^{28} \mathrm{~m}^{-3}$$
D
$$5 \times 10^{28} \mathrm{~m}^{-3}$$
2
AP EAPCET 2022 - 4th July Evening Shift
MCQ (Single Correct Answer)
+1
-0

The current 'I' in the circuit shown in the figure is

AP EAPCET 2022 - 4th July Evening Shift Physics - Current Electricity Question 3 English

A
$$\varepsilon/R$$
B
$$-\varepsilon/R$$
C
$$2\varepsilon/R$$
D
$$-2\varepsilon/R$$
3
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
4
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
$$\frac{2 \pi R M}{1}$$
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