NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 553 - 556 of 2184

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Question number: 553

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

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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.

b.

c.

d.

Question number: 554

» Magnetic Effects of Current and Magnetism » Bar Magnet

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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.

6.52 N

c.

2.56 N

d.

65.62 N

Question number: 555

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

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Assertion-Reason▾

Question

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

Question number: 556

» Magnetic Effects of Current and Magnetism » Bar Magnet

Edit
MCQ▾

Question

The correct statements regarding the lines of force of the magnetic field B are

(1) Magnetic intensity is a measure of lines of force passing through unit area held normal to it

(2) Magnetic lines of force form a closed curve

(3) Due to a magnet magnetic lines of force never cut each other

(4) Inside a magnet, its magnetic lines of force move from North pole of a magnet towards its South pole

Select the correct answers and mark it according to the following codes:

Choices

Choice (4) Response

a.

1 and 2 are correct

b.

2 and 4 are correct

c.

1,2 and 3 are correct

d.

1 and 3 are correct