sci_phy

Magnetic Fields

Chapter summary, hard words and model exam answers for ICSE Class 10 Hindi.

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Physics · CBSE 10 · ICSE 10 · GCSE (AQA, Edexcel, OCR)

We cannot see it, but iron filings or a compass reveal it. The field is strongest near the poles.

A compass needle always lines up along the field, its N end pointing the way the arrow points.

The right-hand grip rule gives the direction: thumb along the current, fingers curl with the field. Reverse the current and the field reverses.

Its field is made by molten iron currents in the core and shields us from charged solar particles.

magnetic field	a region of space where a magnetic force acts on magnetic materials or moving charges
field line	a line showing the direction a free north pole would move; arrows run from N to S outside the magnet
magnetic pole	the regions of a magnet where the field is strongest, named north and south
uniform field	a field of constant strength and direction, shown by equally spaced parallel lines
right-hand grip rule	thumb points along the current, curled fingers give the field direction around a wire
compass	a small pivoted magnet that lines up with the field it sits in
declination	the angle between magnetic north and true (geographic) north at a place
tesla	the SI unit of magnetic flux density, symbol T

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