Eddy currents

 Eddy current testing requires that the material tested be?

• magnetic

• non-magnetic

• conductive

• a and c

when testing for eddy currents

• the test piece must be moved cyclically near the current carrying conductor

• the current carrying conductor must be moved cyclically near the test piece

• either a or b

• the diameter of the conductor is less than 1/10 the thickness of the test piece

The region around a magnet where its magnetic effects can be detected is called the

• near zone

• induction zone

• magnetic field of force

• electro magnetic region of influence

eddy currents are so named becuase

• Eddy current testing requires that the material tested be

• of the circular probes required to induce them

• of their circular paths

• small swirl patterns form on the surface domain and crystal structure

When an alternating voltage induces an EMF, the induced EMF in opposition to the change causing it. This is a statement of

• faraday's law

• lenz's law

• snell's law

• eddy

  's

  law of voltage