Question: Q. 3. Draw the magnetic field lines for a current carrying solenoid when a rod made of (i) copper, (ii) aluminium and (iii) iron are inserted within the solenoid as shown. $\quad$ [ [CBSE SQP 2017-18]
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Solution:
Ans. The magnetic field lines for current carrying solenoid when rod made of (i) copper, (ii) aluminium and (iii) iron are inserted in solenoid as shown :
(a)
(b)
(i) $\mathrm{Cu}=$ Diamagnetic
(ii) $\mathrm{Al}=$ Paramagnetic
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(iii) $\mathrm{Fe}=$ Ferromagnetic
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(AI) Q. 4.(i) Mention two properties of soft iron due to which it is preferred for making an electromagnet?
(ii) State Gauss law in magnetism. How it is different from Gauss law in electrostatics and why?
R [OD I 2016]
Commonly Made Error
- Concept of electromagnet is sometimes not clear to the students.
Answering Tip
- Always read the concept thoroughly and remember electromagnet is not a permanent magnet.
