Page No 233: - Chapter 13 - Magnetic Effect Of Electric Current - Ncert Solutions class 10 - Science

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Question 1:

State Fleming’s left-hand rule.

Answer:

Fleming’s left hand rule states that if we arrange the thumb, the centre finger, and the forefinger of the left hand at right angles to each other, then the thumb points towards the direction of the magnetic force, the centre finger gives the direction of current, and the forefinger points in the direction of magnetic field.

Question 2:

What is the principle of an electric motor?

Answer:

The working principle of an electric motor is based on the magnetic effect of current. A current-carrying loop experiences a force and rotates when placed in a magnetic field. The direction of rotation of the loop is given by the Fleming’s left-hand rule.

Question 3:

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

Answer:

The split ring in the electric motor acts as a commutator. The commutator reverses the direction of current flowing through the coil after each half rotation of the coil. Due to this reversal of the current, the coil continues to rotate in the same direction.