Charging By Friction Quiz: Test Static Electricity Concepts

Concept: friction charging mechanism. Rubbing can cause electrons to move from one material to another due to different electron affinities. The objects end up with equal and opposite net charges.

Concept: conduction charging. When objects touch, electrons can flow until electrostatic equilibrium is approached. The neutral object can gain a net charge.

Concept: induction with grounding. A nearby charge rearranges charges, and grounding provides a path for electrons to move. Removing the ground and the inducer in the right order leaves net charge behind.

Concept: non-contact charging. Induction relies on electric fields causing redistribution of charges. Net charge can remain after grounding and separation without touching the charged object.

Concept: attraction without net charge. The charged object induces charge separation in the neutral object. The nearer opposite charges attract more strongly, producing net attraction.

Concept: polarisation in different materials. In conductors, free electrons move to create separation. In insulators, electrons shift slightly within atoms/molecules, creating induced dipoles.

Concept: electroscope function. Electroscopes show charge by leaf divergence or needle movement. They indicate whether an object is charged and sometimes relative sign.

Concept: like-charge repulsion in the electroscope. The leaves carry like charges and repel. More charge increases repulsion and separation.

Concept: charge redistribution by induction. A negative rod repels electrons, pushing them down into the leaves. This can make leaves diverge even though total charge remains zero.

Concept: conservation with redistribution. Induction rearranges where charges are, but doesn’t create them. If grounding occurs, charge can move to/from earth, but total charge of the larger system is conserved.

Concept: contact charging sign. With contact, electrons may flow from the sphere to the positive rod (or be drawn toward it). The sphere is left with a deficit of electrons, making it positive.

Concept: electron loss means positive. Losing electrons reduces negative charge. With more protons than electrons, the net charge becomes positive.

Concept: induced net charge sign. Proper induction with grounding typically leaves the conductor with opposite sign to the inducing charge. This happens because electrons are added or removed via ground while the inducer is present.

Concept: neutral attraction by induced dipoles. Tiny paper bits are neutral but become polarised in the comb’s electric field. The nearer induced opposite charge causes attraction.

Concept: dipole formation in insulators. Charges in an insulator can shift slightly within molecules/atoms. This creates induced dipoles without free charge transport.

Concept: grounding discharges excess. Ground provides a path for charge to move. Excess electrons can leave a negatively charged conductor, reducing net charge.

Concept: static electricity. Static refers to charge at rest (not a continuous current). It often builds on insulators and discharges suddenly.

Concept: charge sharing. Identical conductors distribute total charge equally when isolated. +8 c split between two gives +4 c each.

Concept: net force from unequal distances. The induced opposite charges are closer to the external charge than the like charges. Because electric force depends strongly on distance, attraction dominates.

Concept: conservation in charging. Electrons transfer from one object to the other. The total charge of the pair remains the same even though each object’s net charge changes.