Electromagnetic Induction Test

Result

Electromagnetic Induction Test - 5

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Question 1
1 / -0

Eddy Currents are

A
induced currents that circulate throughout the volume of a material similar to swirling eddies in a river.

B
gaseous currents

C
plasma currents

D
induced solar currents that circulate through out a river and are swirling .

Solution

Eddy currents (also called Foucault currents) are loops of electrical current induced within conductors by a changing magnetic field in the conductor, due to Faraday's law of induction. Eddy currents flow in closed loops within conductors, in planes perpendicular to the magnetic field. By lenz's law an eddy current creates a magnetic field that opposes a change in the magnetic field that created it, and thus eddy currents react back on the source of the magnetic field.
Question 2
1 / -0

Damping in galvanometers is based on

A
dash pot opposing the motion of the galvanometer needle

B
eddy currents generating currents in the core opposing the motion and bringing the coil to rest quickly.

C
needle movement being opposed by rubber touching the needle lightly

D
needle movement being opposed by oil

Solution

The coil of galvanometer is wound on a light metal frame. When the coil and frame rotate in the field of the permanent magnet, the eddy current set up in the frame oppose the motion so that the coil returns to zero quickly.