NCERT Solutions for Class 7 Science Chapter 14
Important NCERT Questions
7th Chapter 14 Electric Current and its Effects
NCERT Books for Session 2022-2023
CBSE Board and State Board
Questions No: 6
When the current is switched on through a wire, a compass needle kept nearby gets deflected from its north-south position. Explain.
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When an electric current flows through a wire, it creates a magnetic field around it. A compass needle aligns with the Earth’s magnetic field, pointing north-south. When the current passes nearby, its magnetic field affects the compass needle, causing it to deflect from its usual direction. This happens because the magnetic field produced by the current interferes with the Earth’s magnetic field, showcasing the connection between electricity and magnetism, and how a current affects nearby magnetic objects like the compass.
When a current (dc) is passed through a wire, the wire develops magnetism. The magnetic field of the wire interacts with the magnetic poles of the compass needle and it gets deflected from its North-South position.
The current carrying wire produces magnetic field around it. When a compass is kept nearby this wire, the two magnetic field (magnetic field due to wire and magnetic field due to compass) interact each other causing deflection in magnetic needle. When the current is switched off, there is no magnetic field produced by the wire, magnetic needle does not deflect from its north-south position.
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