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.
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