Both the electric field and magnetic field can be defined from the Lorentz force law: The electric force is straightforward, being in the direction of the electric field if the charge q is positive, but the direction of the magnetic part of the force is given by the right hand rule.
3 Magnetic field Ftloop of circuit Electric current M in the circuit. This right-hand rule is different.
Fleming's left-hand rule (for motors), and Fleming's right-hand rule (for generators) are a pair of visual mnemonics. They were originated by John Ambrose Fleming, in the late 19th century, as a simple way of working out the direction of motion in an electric motor...
• Magnetic fields are similar to electric fields, but they are produced only by moving charges while electric fields are produced by both moving charges and stationary charges.
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The Right Hand Rule for Electric Current through a Wire (or Solenoid). Movement of any charged particles creates a magnetic field (B). For electricity, the charged particles are electrons, which are negatively charged.
This implies that an electric current produces a magnetic field, and the field affects the compass needle.
So far we have described the magnitude of the magnetic force on a moving electric charge, but not the direction. The magnetic field is a vector
This is the first of two right-hand rules dealing with magnetism and magnetic forces.