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State right hand thumb rule. A current through a horizontal power line flows in east to west direction. What is the direction of magnetic field at a point directly below it and at a point directly above it? |
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Answer» Right hand thumb rule: It states that if thumb of the right-hand points along direction of current, then the remaining curled fingers of same hand gives the direction of the magnetic field due to the current. ⇒Applying right hand thumb rule, we get that the direction of the magnetic field at a point below the wire is from north to south. The direction of the magnetic field at a point directly above the wire is from south to north. |
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