Question

A very long, straight wire carries current from south to north. An electron is moving at high speed parallel to the wire, also from south to north. The electron is a few centimeters to the west of the wire. What direction is the magnetic force on the electron?

Answer 1

Solution -

Use the right hand thumb rule to determine the direction of magnetic field due to current carrying wire .curl your finger of right hand and point the thumb outward.

The fingers represent the direction of the magnetic field and the thumb represent the direction of the current in wire.

Using right hand rule to determine the direction of magnetic force -

According to right hand rule stretch fore finger , middle finger and thumb perpendicular to each other then middle finger represent the direction of magnetic field , force finger represent the direction of movement of positive charge and thumb represent the direction of the magnetic force.

Once you apply the above laws -

The direction of the magnetic force will be towards eastwards .

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