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=In text Questions of Page No. 224

=In text Questions of Page No. 228

=In text Questions of Page No. 229

=In text Questions of Page No. 231

=In text Questions of Page No. 233

=In text Questions of Page No. 236

=In text Questions of Page No. 237

=In text Questions of Page No. 238

 

In text Questions of Page No. 237

In text Questions of Page No. 237

Q. No 1: State the principle of an electric generator.
Ans:
Electric generator works on the principle of electromagnetic induction. Electricity is generated by rotating a coil inside magnetic field.

Q. No 2: Name some sources of direct current.
Ans:
Some sources of direct current are cell, battery and DC generator, etc.

Q. No 3: Which sources produce alternating current?
Ans:
hydroelectric power plants, AC generators produce alternating current.

Q. No 4: Choose the correct option.
A rectangular coil of copper wires is rotated in a magnetic field. The direction of the induced current changes once in each
(a) two revolutions  (b) one revolution
(c) half revolution    (d) one-fourth revolution
Ans:

(c) When a rectangular coil of copper is rotated in a magnetic field, the direction of the induced current in the coil changes in every half rotation.





State the principle of an electric generator, Name some sources of direct current, Which sources produce alternating current, A rectangular coil of copper wires is rotated in a magnetic field


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