1
AP EAPCET 2022 - 5th July Morning Shift
MCQ (Single Correct Answer)
+1
-0

The resistance of wire at $$0^{\circ} \mathrm{C}$$ is $$20 \Omega$$. If the temperature coefficient of the resistance is $$5 \times 10^{-3}{ }^{\circ} \mathrm{C}^{-1}$$. The temperature at which the resistance will be double of that at $$0^{\circ} \mathrm{C}$$ is

A
$$10^{\circ} \mathrm{C}$$
B
$$200^{\circ} \mathrm{C}$$
C
$$250^{\circ} \mathrm{C}$$
D
$$300^{\circ} \mathrm{C}$$
2
AP EAPCET 2022 - 5th July Morning Shift
MCQ (Single Correct Answer)
+1
-0

An electron having kinetic energy of 100 eV circulates in a path of radius 10 cm in a magnetic field. The magnitude of magnetic field $$|\mathbf{B}|$$ is approximately [Mass of electron $$=0.5 \mathrm{~MeV} \mathrm{c}^{-2}$$, where c is the velocity of light].

A
$$3.3 \times 10^{-4} \mathrm{~T}$$
B
$$2.6 \times 10^{-4} \mathrm{~T}$$
C
$$1.70 \times 10^{-4} \mathrm{~T}$$
D
$$4.3 \times 10^{-4} \mathrm{~T}$$
3
AP EAPCET 2022 - 5th July Morning Shift
MCQ (Single Correct Answer)
+1
-0

A particle of mass $$2.2 \times 10^{-30} \mathrm{~kg}$$ and charge $$1.6 \times 10^{-19} \mathrm{C}$$ is moving at a speed of $$10 \mathrm{~km} \mathrm{~s}^{-1}$$ in a circular path of radius 2.8 cm inside a solenoid. The solenoid has $$25 \frac{\text { turns }}{\mathrm{cm}}$$ and its magnetic field is perpendicular to the plane of the particle's path. The current in the solenoid is

(Take, $$\mu_0=4 \pi \times 10^{-7} \mathrm{~Hm}^{-1}$$)

A
1.25 mA
B
10.20 mA
C
2.50 mA
D
1.56 mA
4
AP EAPCET 2022 - 5th July Morning Shift
MCQ (Single Correct Answer)
+1
-0

Two short magnets of equal dipole moments $$M$$ are fastened perpendicularly at their centres. The magnitude of the magnetic field at a distance $$d$$ from the centre on the bisector of the right angle is ($$\mu_0=$$ Permeability of free space)

A
$$\frac{\mu_0}{4 \pi} \frac{2 \sqrt{2} M}{d^3}$$
B
$$\frac{\mu_0}{4 \pi} \frac{5 M}{d^3}$$
C
$$\frac{\mu_0}{4 \pi} \frac{2 M}{d^3}$$
D
$$\frac{\mu_0}{4 \pi} \frac{10 M}{d^3}$$
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