A current carrying wire is known to produce magnetic lines of force around the conducting straight wire. The direction of the lines of force may be described by _________.

left hand thumb rule for up current and right hand thumb rule for down current

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right hand thumb rule for up current and left hand thumb rule for down current

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right high thumb rule for both up and down currents

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left hand thumb rule for both up and down currents

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Solution

The correct option is D right high thumb rule for both up and down currents
Direction of magnetic field lines at a point due to a straight wire for both up and down currents can be found by using right hand thumb rule (or palm rule) such that the direction of thumb points in the direction of current flowing and then the palm will point in the direction of magnetic field line at that point.

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Similar questions

State right hand thumb rule which describes the direction of magnetic field around a current carrying wire.

The direction of induced current is obtained by:
(a) Fleming's left hand rule
(b) Clock rule
(c) Right hand thumb rule
(d) Fleming's right hand rule.

When a wire is carrying current, the magnetic field around the conductor can be found by left-hand thumb rule.

List I	List II
(a) Fleming's left hand rule	(e) Direction of induced current
(b) Right hand thumb rule	(f) Magnitude and direction of magnetic induction
(c) Biot-Savart law	(g) Direction of force due to magnetic induction
(d) Fleming's right hand rule	(h) Direction of magnetic lines due to current

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