Electric Force and Electric Field Quiz

According to Coulomb's law, the electric force between two charges is inversely proportional to the square of the distance between them. If the distance doubles, the force decreases by a factor of four, making 'decreases' the correct answer.

Electric field strength is measured in Newtons per Coulomb (N/C), which indicates the force experienced by a charge in an electric field. Other options like Volts (V) and Coulombs (C) are not units for electric field strength.

Metal is a good conductor of electricity, allowing charges to dissipate quickly, making it least likely to accumulate static electricity compared to rubber, glass, and plastic, which are insulators.

Friction causes charges to be transferred between objects through contact. When two materials rub against each other, electrons can move from one object to another, resulting in static electricity.

Friction is most effective between insulators because they do not allow electric charge to flow freely, leading to greater surface interaction and resistance compared to conductors, liquids, or gases.

During friction, electrons transfer between objects, leading to static electricity. This transfer can cause one object to become positively charged and the other negatively charged, but electrons are not destroyed or disappear.

Bringing a charged rod near a neutral metal sphere demonstrates induction because it causes the charges in the sphere to rearrange without direct contact, leading to polarization.

In induction, charges are rearranged due to the influence of a nearby electric field. This process causes the distribution of charges within a conductor to shift, leading to polarization without creating or transferring charges.

During conduction, the direct transfer of charges occurs between objects. This process involves the movement of electrons from one object to another, allowing for the transfer of electric charge.

In conduction, when a charged rod touches a neutral object, it transfers charge directly, resulting in the neutral object becoming charged. This process exemplifies conduction, as opposed to induction, which involves charge separation without direct contact.