1
AP EAPCET 2022 - 4th July Evening Shift
+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
$$\frac{2 \pi R M}{1}$$
2
AP EAPCET 2022 - 4th July Evening Shift
+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
$$\frac{2}{\sqrt{3}} \mathrm{G}$$
3
AP EAPCET 2022 - 4th July Morning Shift
+1
-0

A compass needle oscillates 20 times per minute at a place where the dip is $$45^{\circ}$$ and the magnetic field is $$B_1$$. The same needle oscillates 30 times per minute at a place where the dip is $$30^{\circ}$$ and magnetic field is $$B_2$$. Then, $$B_1: B_2$$ is

A
$$9 \sqrt{3}: 4 \sqrt{2}$$
B
$$4 \sqrt{2}: 9 \sqrt{3}$$
C
$$3 \sqrt{3}: 2 \sqrt{2}$$
D
$$2 \sqrt{2}: 3 \sqrt{3}$$
4
AP EAPCET 2021 - 20th August Morning Shift
+1
-0

A paramagnetic sample showing a net magnetisation of $$0.8 \mathrm{~A} \mathrm{~m}^{-1}$$, when placed in an external magnetic field of strength $$0.8 \mathrm{~T}$$, at a temperature $$5 \mathrm{~K}$$. If the temperature is raised to $$20 \mathrm{~K}$$, then the magnetisation becomes

A
$$0.8 \mathrm{~A} \mathrm{~m}^{-1}$$
B
$$0.2 \mathrm{~A} \mathrm{~m}^{-1}$$
C
$$0.1 \mathrm{~A} \mathrm{~m}^{-1}$$
D
$$0.4 \mathrm{~A} \mathrm{~m}^{-1}$$
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