Magnetic Effects of Current and Magnetism (NEET Physics): Questions 19 - 22 of 155

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Question number: 19

» Magnetic Effects of Current and Magnetism » Ampere's Law

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.

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

b.

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

c.

Ꭺ is false but Ꭱ is true

d.

Both Ꭺ and Ꭱ are false

Question number: 20

» Magnetic Effects of Current and Magnetism » Electric Charge Moving in Magnetic Field

MCQ▾

Question

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.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 21

» Magnetic Effects of Current and Magnetism » Bar Magnet

MCQ▾

Question

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.

2.56 N

c.

65.62 N

d.

6.52 N

Question number: 22

» Magnetic Effects of Current and Magnetism » Para, Dia and Ferro-Magnetic Substances

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.

Ꭺ is true but Ꭱ is false

b.

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

c.

Both Ꭺ and Ꭱ are false

d.

Ꭺ is false but Ꭱ is true

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