Magnetic Effects of Current and Magnetism [NEET (2024 Updated)-National Eligibility cum Entrance Test (Medical) Physics]: Questions 19 - 22 of 246

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Question 19

Question Assertion-Reason▾

Assertion(Ꭺ)

If two long wires, hanging freely are connected to a battery in series, they come closer to each other.

Reason(Ꭱ)

Force of repulsion acts between the two wires carrying current.

Choices

Choice (4)Response

a.

Ꭺ is false but Ꭱ is true

b.

Both Ꭺ and Ꭱ are false

c.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

d.

Ꭺ is true but Ꭱ is false

Edit

Question 20

Question MCQ▾

If an electron is moving with velocity v in an orbit of radius r in a hydrogen atom, then the equivalent magnetic moment is

Choices

Choice (4)Response

a.

b.

c.

d.

Edit

Question 21

Question MCQ▾

A bar magnet with its poles 25 cm apart and of pole strength 24.0 A-m rests with its center on a frictionless pivot. A force F is applied on the magnet at a distance of 12 cm from the pivot, so that it is held in equilibrium at an angle of 30° with respect to a magnetic field of induction 0.25 T. The value of force F is

Choices

Choice (4)Response

a.

6.25 N

b.

6.52 N

c.

2.56 N

d.

65.62 N

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Question 22

Question Assertion-Reason▾

Assertion(Ꭺ)

The earth magnetic field due to iron present in the core.

Reason(Ꭱ)

At very high temperature, iron is no longer ferromagnetic.

Choices

Choice (4)Response

a.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

b.

Both Ꭺ and Ꭱ are false

c.

Ꭺ is true but Ꭱ is false

d.

Ꭺ is false but Ꭱ is true

Edit