Physics
Grade-10
Easy
Question
Study the statements given below:
(i) Electromagnets can be made more powerful than ordinary bar magnets.
(ii) Soft iron core is used in electromagnets
(iii) The poles of an electromagnet are not affected by the direction of the current.
Which of the above statements about the electromagnets is/are correct?
- Only (i) and (ii)
- Only (ii) and (iii)
- Only (i) and (iii)
- (i), (ii), and (iii)
Hint:
- The strength of a magnetic field of an electromagnet depends on the core material
- Soft iron loses its magnetism as soon as the current stops
- The polarity of an electromagnet can be reversed by reversing the flow of current through the coil.
The correct answer is: Only (i) and (ii)
- Electromagnets can be made more powerful than ordinary bar magnets. The strength of a magnetic field of an electromagnet depends on the core material, the number of solenoid windings and the intensity of the current.
- Soft iron is easy to magnetize and demagnetize. Soft iron loses its magnetism as soon as the current stops flowing and hence it is a temporary magnet.
- The poles of an electromagnet depend upon the direction of current flowing through a circuit. The polarity of an electromagnet can be reversed by reversing the flow of current through the coil.
- The correct option is A Only (i) and (ii)
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