The poles of which magnet can be reversed?
a) permanent magnet
b) electromagnet
c) bar magnet
d) all of these
How can we
reverse the poles of electromagnet?
a) by decreasing voltage
b) by increasing current
c) by reversing the current
d) all of these
The strength of the electromagnet depends on which of the following factors?
a) voltage
b) No. of loops in coil
c) amount of current
d) both b and c
More loops in coil of electromagnet create a……..magnetic field.
a) weaker
b) stronger
c) moderate
d) not affected
More current in coil of electromagnet create a……..magnetic field.
a) weaker
b) stronger
c) moderate
d) not affected
Less number of loops in coil of electromagnet creates a……..magnetic field.
a) weaker
b) stronger
c) moderate
d) not affected
