AP EAPCET 2022 - 5th July Morning Shift | Magnetism and Matter Question 8 | Physics

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)

$$\frac{\mu_0}{4 \pi} \frac{2 \sqrt{2} M}{d^3}$$

$$\frac{\mu_0}{4 \pi} \frac{5 M}{d^3}$$

$$\frac{\mu_0}{4 \pi} \frac{2 M}{d^3}$$

$$\frac{\mu_0}{4 \pi} \frac{10 M}{d^3}$$

AP EAPCET 2022 - 4th July Evening Shift

MCQ (Single Correct Answer)

-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

$$M$$

$$\frac{2 R M}{\pi l}$$

$$\frac{2 M}{\pi}$$

$$\frac{2 \pi R M}{1}$$

AP EAPCET 2022 - 4th July Evening Shift

MCQ (Single Correct Answer)

-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

$$\frac{\sqrt{3}}{5} G$$

$$\sqrt{3} \mathrm{G}$$

$$\frac{20}{\sqrt{3}} \mathrm{G}$$

$$\frac{2}{\sqrt{3}} \mathrm{G}$$

AP EAPCET 2022 - 4th July Morning Shift

MCQ (Single Correct Answer)

-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

$$9 \sqrt{3}: 4 \sqrt{2}$$

$$4 \sqrt{2}: 9 \sqrt{3}$$

$$3 \sqrt{3}: 2 \sqrt{2}$$

$$2 \sqrt{2}: 3 \sqrt{3}$$

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