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 05:56 PM. |
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