Induction Solenoids

Induction coils

0309181127

 

  • When current through a solenoid changes, a magnetic field is induced within the solenoid. If two solenoids are concentric with each other, the induced field in one solenoid produces a changing current in the other.
  • Connect a power supply to one solenoid and a galvanometer to the other.
  • Unless steel rod is inserted in innermost cylinder (shown above), induced magnetic field is too week to produce a noticeable effect. Steel rod greatly enhances effect.

Location

Solenoids: L01, section B-2

Galvanometer: L35, section F-3

Power supply: L35, section F-1

 

 

Faraday Cage

 

Faraday Cage demo picture

  • Use the cage in conjunction with Van de Graaff to demonstrate
    electrostatic shielding.
  • Place a hand-held radio inside the cage to demonstrate electromagnetic
    shielding (radio in cage should pick-up no signal).
  • Located in L01, section A2.

 

Charge on Conductor

 

Charge on Conductor demo picture

Charge on Conductor demo picture 2

  • Use rod and fur to charge conductors. To
    determine charge distribution on conductors use wand and electroscope, or
    proof plane and Faraday Ice Pail (right) with electrometer.
  • According to theory, no charge should reside
    on the inner side of a hollow conductor.

Location

  • Conductors: L01, section B1.
  • Rod and fur: L01, section A2.
  • Wand and proof plane: L01, section A2, plastic
    bin.
  • Faraday Ice Pail: L01, A2.
  • Electrometer: L01, A1.

 

Coulomb Apparatus

 

Coulomb Apparatus demo picture
Coulomb Apparatus demo picture 2

  • Demonstrate 1/r^2 dependence of Coulomb force.
  • For accurate measurements, potential difference between charged
    spheres should be maintained using high-voltage power supply.
  • For less-quantitative measurement, spheres can be charged
    with rod and fur. Charge on sphere can then be measured using proof plane,
    Faraday Ice Pail, and electrometer (right).

Location

  • Coulomb Apparatus: L01, section A2.
  • Proof plane: L01, section A2, plastic bin.
  • Faraday Ice Pail: L01, A2.
  • Electrometer: L01, A1.

 

Faraday Ice Pail

 

Faraday Ice Pail demo photo

  • Use the ice pail in conjunction with an electrometer (shown)
    to measure charge and potential difference. Touch the Proof Plane to the point of interest on the charged body, then place the Proof Plane inside the ice pail. The Electrometer reading will be directly proportional to the charge
    on the Proof Plane.
  • Located in L01: proof planes-section A2; electroscope- section
    A1; Ice Pail- section…