Question

8. Which of these are not properties of
electromagnets?
(i) An increase in current increases its
strength.
(ii) They are permanent magnets.
(iii) They remain magnetised even after
the current is switched off.
(iv) They are of varying shapes and
sizes.
a) (i) and (ii)
c) (i) and (iv)
b)(ii) and (iii)
d) (ii) and (iv)​

Answer 1

Answer:

Unlike a permanent magnet, the strength of an electromagnet can easily be changed by changing the amount of electric current that flows through it. As the current flowing around the core increases, the number of aligned atoms increases and the stronger the magnetic field becomes.

Answer 2

Answer:

1 = An increase in current increases its strength .

2 = They remain magnetised even after the current is switched off .

• I hope answer is correct ☹️☹️