A current carrying straight wire held perpendicular to the plane of paper and current passes through this conductor in the vertically upward direction. What is the direction of magnetic field produced around it?
Answers
ANSWER :
According to right-hand thumb rule, the direction of magnetic field produced around the given conductor is anticlockwise.
We know that when the magnetic field and the direction of current are perpendicular to each other, the deflection is maximum. But when they are in the same plane, no deflection takes place.
The following conditions are required to obtain permanent electromagnet when a current carrying solenoid is used:
1. Rod inside the solenoid should be made of magnetic material like steel which should retain magnetic properties for a long time after magnetization.
2. The current through the solenoid should be direct current.
3. The number of turns in the solenoid should be large and closely packed, so that a strong uniform magnetic field inside it is produced.