A safer way to create a strong magnetic field that provides a greater force is……..
a) increase current
b) increase voltage
c) wrap wire into coil
d) none of these
How can we increase the magnetic force of coil?
a) increase current
b) increase voltage
c) insert a metal rod inside coil
d) all of these
The rod which is inserted inside the coil to increase the magnetic field is called……
a) rod
b) core
c) bar
d) column
When a core is inserted inside the coil of wire, the resulting device is called……
a) motor
b) magnet
c) electromagnet
d) transformer
Which of the following magnet is/are turned ON/OFF?
a) permanent magnet
b) electromagnet
c) bar magnet
d) all of these
How can we turn ON/OFF the electromagnet?
a) by decreasing voltage
b) by increasing current
c) by turn ON/OFF current
d) all of these
