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عـــــذاري 04-11-2016 02:27 AM

سؤال وجواب في المغناطيسية magnetism
 





Question 1
Question: What happens if a current carrying conductor is placed in a magnetic field?


Answer: A current carrying conductor placed in a magnetic field experiences a force whose direction is given by Fleming's left hand rule.

Question 2
Question: What is electromagnetic induction?


Answer: The phenomenon by which an emf or current is induced in a conductor due to change in the magnetic field near the conductor is known as electromagnetic induction.

Question 3
Question: A positive charge moving towards west is deflected towards
north. What is the direction of the magnetic field?


Answer: According to Fleming's left hand rule, the magnetic field is in the upward direction. It is perpendicular to both motion and force.

Question 4
Question: When does a current carrying conductor experience a maximum
force in the magnetic field?


Answer: When it is placed perpendicular to the magnetic field.

Question 5
Question: What is the frequency of AC in India?

Answer: 50 Hz

Question 6
Question: What is the frequency of DC?


Answer: Zero

Question 7
Question: What do you understand by the term 'current rating' of an electric fuse?


Answer: The maximum amount of current that can be passed through the fuse wire without melting it.

Question 8
Question: Name the alloy used to make fuse wire.


Answer: Alloy of lead and tin.

Question 9
Question: What is the use of a commutator in an electric motor?


Answer: A commutator is used to reverse the direction of current after every half rotation of the coil.

Question10
Question: How can you convert an AC generator to a DC generator?


Answer: An AC generator converted to a DC generator by replacing the slip rings with split ring commutator.


الساعة الآن 10:58 PM.

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