The directions of current flowing in the coil of an electromagnet at its two ends X and Y are as shown below: Name and state the rule which you have used to determine the polarities.

The name of the rule which is used to determine the polarities of the ends is clock-face rule. According to the clock face rule, when we look at one face of a coil carrying some current, if the current appears to flow in clockwise direction, then that face of the coil is south pole. If the current appears to flow in anticlockwise direction, then that face of the coil is north pole.

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

AC generator has slip rings while the DC generator has a commutator

AC generator has an electromagnet while a DC generator has permanent magnet

DC generator will generate a higher voltage

AC generator will generate a higher voltage

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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10th CBSE

IMPORTANT

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In the straight wire A, current is flowing in the vertically downward direction whereas in wire B the current is flowing in the vertically upward direction. What is the direction of magnetic field: in wire B? Name the rule which you have used to get the answer.

Important Questions on Magnetic Effect of Electric Current

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10th CBSE

IMPORTANT

Science for Tenth Class Part - 1 Physics>Chapter 2 - Magnetic Effect of Electric Current>Questions Based on High Order Thinking Skills (HOTS)>Q 38

The figure shows a solenoid wound on a core of soft iron. Will the end A be a N pole or S pole when the current flows in the direction shown?

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10th CBSE

IMPORTANT

Science for Tenth Class Part - 1 Physics>Chapter 2 - Magnetic Effect of Electric Current>Questions Based on High Order Thinking Skills (HOTS)>Q 39

A current-carrying straight wire is held in exactly vertical position. If the current passes through this wire in the vertically upward direction, what is the direction of magnetic field produced by it? Name the rule used to find out the direction of magnetic field.

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10th CBSE

IMPORTANT

Science for Tenth Class Part - 1 Physics>Chapter 2 - Magnetic Effect of Electric Current>Questions Based on High Order Thinking Skills (HOTS)>Q 40

For the coil in the diagram below, when the switch is pressed, what is the polarity of end A? (North Pole, South Pole)

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10th CBSE

IMPORTANT

Science for Tenth Class Part - 1 Physics>Chapter 2 - Magnetic Effect of Electric Current>Questions Based on High Order Thinking Skills (HOTS)>Q 40

For the coil in the diagram below, when the switch is pressed which way will the compass point then?
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10th CBSE

IMPORTANT

Science for Tenth Class Part - 1 Physics>Chapter 2 - Magnetic Effect of Electric Current>Questions Based on High Order Thinking Skills (HOTS)>Q 41

A current flows downwards in a wire that passes vertically through a table top. Will the magnetic field lines around it go clockwise or anticlockwise when viewed from above the table?

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10th CBSE

IMPORTANT

Science for Tenth Class Part - 1 Physics>Chapter 2 - Magnetic Effect of Electric Current>Questions Based on High Order Thinking Skills (HOTS)>Q 42

The directions of current flowing in the coil of an electromagnet at its two ends