Question

Name and state the rule to determine the direction of a:
(i) magnetic field produced around a current carrying straight conductor.
(ii) force experienced by a current carrying straight conductor placed in a magnetic field which is perpendicular to it.

Answer 1

(i). The rule is the Right-Hand Thumb Rule.
- According to this rule: If the thumb of the right hand points in the direction of current, the curled fingers show the direction of the magnetic field.

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(ii). The rule is the Fleming’s Left-Hand Rule.
- According to this rule: Stretch the forefinger, middle finger, and thumb of the left hand mutually perpendicular to each other.
- Forefinger: Direction of magnetic field.
- Middle finger: Direction of current.
- Thumb: Direction of force experienced by the conductor.