Question

Fig. 7.12 The strength of an electromagnet increases with the number of furre in se
From this activity we learn the following properties of an electromagnet
1. An electromagnet's strength depends on the number of turns of ware and the
of current passing through it,
2. An electromagnet is not a permanent magnet, its magnetism lasts
a current passes through its coit. Once the current stops, the fron
its magnetism
The fact that the magnetism of an electromagnet lasts only while a cus
ough its coil has many uses. We use a soft iron core to make sure that an e
es its magnetism once the current is switched off. If steel or some other
re used for the core, it would retain magnetism even after the current was
es of electromagnets Electromagnets have numerous uses. Some com
in helow.
un iron obiec​

Answer 1

Answer:

increse of battery

Explanation: