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Magnetic fields

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A region where magnetic materials and also wires carrying current experience a force acting on them.
What is a magnetic field?
Concentric circles with the wire as the centre
What is the magnetic field around a current carrying wire made up of?
The crane could pick things up but not put them down
Why are ordinary magnets not used in cranes?
The magnet can be switched on when you want to pick up things and switched off when you want to drop it
Why are electromagnets good to used in cranes?
Increasing the strength of the magnetic field
How can the size of the force be increased?
It is reversed
If the direction of the current or the direction of the magnetic field is reversed, what happens to the direction of the force?