Which of the following is correct regarding eddy currents in the coil?

Question

Question

This question was previously asked in

Navik GD 2022 (All Shift) Memory Based Paper (Section I + II)

Answer 1

CONCEPT:

Eddy Current: The loops of electrical current induced within conductors by changing magnetic fields in the conductor are called eddy currents.
- Eddy currents are generated according to Faraday’s law of induction.
- Eddy currents flow in the form whirlpool.
- Within conductors, Eddy currents flow in closed loops, in the perpendicular plane of the magnetic field.
- Eddy currents produce undesirable effects if the large eddy current flows in the transformer or core of a choke coil etc.
By using a laminated core, the eddy currents produced in the core of a transformer are reduced.
Eddy currents cause a loss of energy because they have the tendency to oppose.
Eddy currents transform useful energy, into heat, which isn’t generally useful.
Nowadays, electric brakes are provided on the trains in addition to those vacuum brakes.

EXPLANATION:

Option 1: Eddy currents flow in a closed-loop, not in a straight line.
- So this is not the correct answer.
Option 2: Eddy currents lose the generated electrical energy by generating heat.
- So this is not the correct answer.
Option 3: By making laminated core in the transformer, eddy currents are reduced.
- This makes to decreases the loss of energy.
So this is not the correct answer.
Option 4: Eddy currents transform useful energy, into heat, which isn’t generally useful.
- So this is the correct statement.
Hence the correct answer is option 4.