Subject :NSO Class : Class 6
Prerna wants to make the electromagnet in the given set-up stronger.
Which of the following should she carry out ?
(1) Increase the number of magnets.
(2) Increase the number of batteries.
(3) Increase the length of the wire.
(4) Increase the number of coils around the magnet.
A1 and 2 only
B1 and 3 only
C2 and 3 only
D2 and 4 only