Moving Charges and Magnetic Field — Chapter Summary
ICSE · Class 12 · Physics
Summary of Moving Charges and Magnetic Field for ICSE Class 12 Physics. Part of the ICSE Class 12 Physics syllabus.
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Overview
Magnetic effects of electric current form the basis of many important devices and phenomena. A current-carrying conductor produces a magnetic field around it, and a magnetic field exerts force on moving charges and current-carrying conductors. The chapter develops the idea of magnetic field, the Bio
Key Concepts
The region near a magnet where
The region near a magnet where a magnetic needle experiences a torque and rests in a definite direction is called a magnetic field. The direction at a
A current
A current-carrying wire deflects a nearby magnetic needle. Reversing the current reverses the deflection. Increasing current or reducing distance incr
The magnetic field due to
The magnetic field due to a small current element depends on current, element length, sine of the angle between the element and the line joining the e
For a straight infinite wire
For a straight infinite wire, B = (mu0)/(2 pi) times I/r. At the centre of a circular coil, B = mu0 N I/(2a). For a semi-circular loop, the field is h
The line integral of magnetic field
The line integral of magnetic field around any closed path equals mu0 times the current enclosed by the path.
Learning Objectives
- Understand the concept of magnetic field and the meaning of field direction.
- Explain Oersted’s experiment and the idea that moving charges produce magnetic fields.
- Use the Biot-Savart law to find magnetic field due to current elements and current-carrying conductors.
- Apply Ampere’s circuital law to long wires, solenoids, and toroids.
- Describe force on a moving charge in a magnetic field and the path of the charge.
Frequently Asked Questions
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Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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