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Magnetism And Matter

25 mcqs are there

Nov 21, 5:00 PM

30 minutes

Nov 21, 5:30 PM

25.0 marks

MCQ

25 questions

Yayati Keshari

You are in the class of Physics by YK sir 🙏🏾

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Question Text

Question 1 :
The main advantage of a permanent magnet over an electromagnet is that a permanent magnet does not require a continuous supply of electrical energy to maintain its magnetic field. State whether the above statement is true or false?

Question 3 :
A bar magnet has coercivity $4\times10^3 Am^{-1}$. It is placed in a solenoid having $40$ turns per cm and is $1.2m$ long. The current carried by the solenoid to demagnetize  the bar magnet is :

Question 5 :
The ratio of magnetic induction of magnetic field strength in a medium gives magnetic permeability.

Question 6 :
State whether true or false : An electromagnet requires a continuous supply of current to maintain the magnetic field.

Question 9 :
The angle of inclination of the axis of the magnetic needle to the horizontal plane when suspended freely and is at rest is known as

Question 10 :
A bar magnet is cut into two equal halves by a plane parallel to the magnetic axis. From the given following physical quantities, which remains unchanged is :

Question 11 :
A thin diamagnetic rod is placed vertically between the poles of an electromagnet. When the current in the electromagnet is switched on, then the diamagnetic rod is pushed up, out of the horizontal magnetic field. Hence the rod gains gravitational potential energy. The work required to do this comes from.

Question 12 :
The magnetic moment is a vector quantity whose direction is from south pole to north pole.

Question 15 :
The magnetising field required to be applied in opposite direction to reduce residual magnetism to zero is called

Question 16 :
A long solenoid has 1000 turns per meter and carries a current of 1 A. It has a soft Iron core of$ u_{r}= 1000 $. The core is heated beyond the Curie temperature,$ T_{e^{-}} $

Question 17 :
The relative permeability of a medium is $0.075$. What is the magnetic susceptibility?

Question 22 :
The ratio of intensity of magnetisation and magnetising field is called

Question 23 :
State whether true or false : An electromagnet can produce very strong magnetic force as compared to permanent magnet.

Question 25 :
The magnetic moment of a bar magnet of length $20\ cm$ is $3.6 \times 10^{-6} Am^{2}$. The magnetic length is $90\%$ of its geometric length. The pole strength is:

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