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Showing 1 question in Physics for Class 10. Tap a card to reveal the answer.
PhysicsMagnetic Effects of Electric CurrenteasyState the right-hand thumb rule for the magnetic field around a straight current-carrying wire.
Reveal answer ↓
What it is
A current in a straight wire creates circular magnetic field lines around it.
Answer
If you hold the straight conductor in your right hand with the thumb pointing in the direction of the current, the curled fingers show the direction of the concentric circular magnetic field lines around the wire.
- •Thumb -> direction of current
- •Curled fingers -> direction of field
- •Field lines are concentric circles around the wire
Why learn this
It's the principle behind electromagnets, electric motors, bells and MRI machines.
💡 Memory trick
Right hand: thumb = current, curled fingers = the circular magnetic field.