sci_phy

Static Electricity

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)

Only electrons move; protons stay fixed. The object that gains electrons is negative, the one that loses them is positive.

Coulomb's law gives the size of the force: F = k q1 q2 / r squared. Doubling the distance makes the force four times weaker.

Field lines point out of positive and into negative charges. Closer lines mean a stronger field.

Sparks from static can ignite fuel vapour, so tankers are earthed. Lightning is a giant static discharge between cloud and ground.

static electricity	electric charge built up on an insulator that does not flow as a current
electron	a tiny negatively charged particle that can move between objects
friction	the rubbing of two surfaces, which can transfer electrons
charge	a property of matter that causes electric force; can be positive or negative
Coulomb's law	the rule giving the force between two charges, F = k q1 q2 / r squared
electric field	the region around a charge where another charge feels a force
field line	a line showing the direction of force on a positive charge; goes + to -
earthing	connecting an object to the ground so excess charge flows away safely

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