About This

• 1.Happy and easy to learn.
• 2.exercise your children hands-on ability.
• 3.Exercise your children's ability of observation,thinking and analysis.
• 1.Left hand rule:
• Electromagnetism, the left hand placed in a magnetic field so that the magnetic induction lines vertical penetration of the palm, palm facing the N pole (fork in the tip out), denotes four fingers pointing to the current direction, the Direction of the thumb is that a conductor direction of force.