Conductors and Insulators

Conductors Insulators

  • Resistivity is a material property, measured in (Ω·m)

Charging by Conduction

Charging a Neutral Object by Conduction A sphæ with of - cha— is
 bn•t to a . the sphæ to the sp.d The sphæ - cha— the

The Electroscope

  • An electroscope is used to detect small electric charges based on conduction


Charging by Induction

Charging by Induction sph— The pne of a cha— e- to sph— B to A. The
 tm sphæ . Sphæ B is The cha— sphæ A the . The t. sph— the op—e . of
 the .

Bring positive rod Ground the electroscope. Electrons from Earth
 ground balance charge of positive rod. Sever ground path and rod.

Polarization and Electric Dipole Moment

  • When a charged object is brought near a conductor, the electrons in the conductor are free to move

  • When a charged object is brought near an insulator, the electrons are not free to move, bu they may spend a little more time on the side of their orbit than another, creating a net separation of charge in a process known as polarization

  • The distance between the shifted positive and negative charges, multiplied by the charge, is known as the electric dipole moment



Coulomb's law


12 12 12 12 2 12 4TEo r

Practice Question 1

Three point charges are located at the corners of a 3WC and right
triangle as shown, where ql q2 q3 -4pC. If ql and q2 are each 1 cm from
q3, find the net force on q3. = IOØA..'J Got F 10€oD < IOW ) 5 29--4/ @
qs0 5 3

Practice Question 2

Two identical charged balls of mass 5 mg are hung from the ceiling by
a light string of length 20 cm. The total angle between them is 12
degrees. Find the magnitude of the charge on each ball. nose q • 10 '
./b•lö C

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