NEET 2017 | Magnetism and Matter Question 17 | Physics

A 250-turn rectangular coil of length 2.1 cm and width 1.25 cm carries a current of 85 $$\mu $$A and subjected to a magnetic field of strength 0.85 T. Work done for rotating the coil by 180^o against the torque is

4.55 $$\mu $$J

2.3 $$\mu $$J

1.15 $$\mu $$J

9.1 $$\mu $$J

NEET 2017

MCQ (Single Correct Answer)

-1

If $$\theta $$₁ and $$\theta $$₂ be the apparent angles of dip observed in two vertical planes at right angles to each other, then the true angle of dip $$\theta $$ is given by

tan²$$\theta $$ = tan²$$\theta $$₁ + tan²$$\theta $$₂

cot²$$\theta $$ = cot²$$\theta $$₁ $$-$$cot²$$\theta $$₂

tan²$$\theta $$ = tan²$$\theta $$₁ $$-$$ tan²$$\theta $$₂

cot²$$\theta $$ = cot²$$\theta $$₁ + cot²$$\theta $$₂

NEET 2016 Phase 2

MCQ (Single Correct Answer)

-1

A bar magnet is hung by a thin cotton thread in a uniform horizontal magnetic field and is in equilibrium state. The energy required to rotate it by 60^o is W. Now the torque required to keep the magnet in this new position is

$${W \over {\sqrt 3 }}$$

$$\sqrt 3 W$$

$${{\sqrt 3 W} \over 2}$$

$${{2W} \over {\sqrt 3 }}$$

NEET 2016 Phase 1

MCQ (Single Correct Answer)

-1

The magnetic susceptibility is negative for

ferromagnetic material only

paramagnetic and ferromagnetic materials

diamagnetic material only

paramagnetic material only

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