Q1
The rule used to find the direction of a magnetic field around a wire is the:
Aright-hand thumb rule
Bleft-hand rule
COhm's rule
DFaraday's rule
CBSEClass 10 (CBSE)ScienceCh 12 · Topic 1
Magnetic Field Due to a Current-Carrying Conductor
Learning how a magnetic field forms around a wire carrying electric current.
Core concept
A solenoid (a long coil of wire) carrying current produces a magnetic field similar to that of a bar magnet, with distinct north and south poles, and this field can be significantly strengthened by inserting a soft iron core, creating an electromagnet. The strength of an electromagnet's field depends on the current strength, the number of coil turns, and the core material — this principle underlies the design of devices like electric bells, loudspeakers, and MRI machines.
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• A current-carrying wire produces a magnetic field with circular field lines around it.
• The right-hand thumb rule determines the direction of the magnetic field from current direction.
• A solenoid produces a magnetic field like a bar magnet, with north and south poles.
• Electromagnet strength depends on current, number of coil turns, and the core material.