WB JEE 2021 | Magnetism Question 12 | Physics

1

WB JEE 2021

MCQ (Single Correct Answer)

+1

-0.25

WB JEE 2021 Physics - Magnetism Question 10 English

For two types of magnetic materials A and B, variation of $$1\over\chi$$ ($$\chi$$ : susceptibility) versus temperature T is shown in the figure. Then,

A

A is diamagnetic and B is paramagnetic.

B

A is feromagnetic and B is diamagnetic.

C

A is paramagnetic and B is feromagnetic.

D

A is paramagnetic and B is diamagnetic.

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WB JEE 2020

MCQ (Single Correct Answer)

+1

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WB JEE 2020 Physics - Magnetism Question 31 English

As shown in the figure, a single conducting wire is bent to form a loop in the form of a circle of radius r concentrically inside a square of side a, where a : r = 8 : $$\pi $$. A battery B drives a current through the wire. If the battery B and the gap G are of negligible sizes, determine the strength of magnetic field at the common centre O.

A

$${{{\mu _0}I} \over {2\pi a}}\sqrt 2 (\sqrt 2 - 1)$$

B

$${{{\mu _0}I} \over {2\pi a}} (\sqrt 2 + 1)$$

C

$${{{\mu _0}I} \over {\pi a}}2\sqrt 2 (\sqrt 2 + 1)$$

D

$${{{\mu _0}I} \over {\pi a}}2\sqrt 2 (\sqrt 2 $$ - $$ 1)$$

3

WB JEE 2020

MCQ (Single Correct Answer)

+1

-0.25

WB JEE 2020 Physics - Magnetism Question 32 English

As shown in the figure, a wire is bent to form a D-shaped closed loop, carrying current I, where the curved part is a semi-circle of radius R. The loop is placed in a uniform magnetic field B, which is directed into the plane of the paper. The magnetic force felt by the closed loop is

A

zero

B

IRB

C

2IRB

D

$${1 \over 2}$$ IRB

4

WB JEE 2019

MCQ (Single Correct Answer)

+1

-0.25

To which of the following quantities, the radius of the circular path of a charged particle moving at right angles to a uniform magnetic field is directly proportional?

A

energy of the particle

B

magnetic field

C

charge of the particle

D

momentum of the particle