What is the role of the split ring in an electric motor?

Commutator or split ring changes the direction of current in the coil of the electric motor, after every half revolution. Note: Split ring is also known as commutator. The function of commutator rings is to reverse the direction of current flowing through the coil every time the coil just passes the vertical position during a revolution.

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Science for Tenth Class Part - 1 Physics>Chapter 2 - Magnetic Effect of Electric Current>Multiple Choice Questions (MCQs)>Q 25

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A rectangular coil of copper wire is rotated in a magnetic field. The direction of induced current changes once in each:

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Important Questions on Magnetic Effect of Electric Current

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Science for Tenth Class Part - 1 Physics>Chapter 2 - Magnetic Effect of Electric Current>Multiple Choice Questions (MCQs)>Q 26

The phenomenon of electromagnetic induction is:

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Science for Tenth Class Part - 1 Physics>Chapter 2 - Magnetic Effect of Electric Current>Multiple Choice Questions (MCQs)>Q 27

The device used for producing electric current is called a:

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Science for Tenth Class Part - 1 Physics>Chapter 2 - Magnetic Effect of Electric Current>Multiple Choice Questions (MCQs)>Q 28

The essential difference between an AC generator and a DC generator is that:

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Science for Tenth Class Part - 1 Physics>Chapter 2 - Magnetic Effect of Electric Current>Multiple Choice Questions (MCQs)>Q 29

When the switch S is closed in the figure given below, the pointer of the galvanometer moves to the right.
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If S is kept closed, the pointer will:

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Science for Tenth Class Part - 1 Physics>Chapter 2 - Magnetic Effect of Electric Current>Multiple Choice Questions (MCQs)>Q 30

Each one of the following changes will increase emf (or voltage) in a simple generator except:

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Science for Tenth Class Part - 1 Physics>Chapter 2 - Magnetic Effect of Electric Current>Multiple Choice Questions (MCQs)>Q 31

The north pole of a long bar magnet was pushed slowly into a short solenoid connected to a galvanometer. The magnet was held stationary for a few seconds with the north pole in the middle of the solenoid and then withdrawn rapidly. The maximum deflection of the galvanometer was observed when the magnet was:

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Science for Tenth Class Part - 1 Physics>Chapter 2 - Magnetic Effect of Electric Current>Multiple Choice Questions (MCQs)>Q 32

An electric generator converts:

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Science for Tenth Class Part - 1 Physics>Chapter 2 - Magnetic Effect of Electric Current>Multiple Choice Questions (MCQs)>Q 33

A d.c. generator is based on the principle of: