| Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). |
| Mark the correct choice as: |
| Assertion [A]: The core of transformer is made laminated in order to increase the eddy currents. |
| Reason (R): The sensitivity of transformer increases with increase in the eddy currents. |
A) Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A]
B) Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A]
C) Assertion [A] is true but Reason (R) is false
D) Assertion [A] is false and Reason (R) is also false
Correct Answer: D
Solution :
(d) Eddy current is produced in the iron core due to induced e.m.f. Since, resistance of the iron core is quite small, the magnitude of eddy currents is quite large. As a result, large amount of heat is produced. To avoid it, a laminated core is used in a transformer. In laminated core iron strips are quite thin and each strip possesses very large resistance, the magnitude of eddy currents very large resistance, the magnitude of eddy currents produced is quite small and hence only a small amount of heat is produced.
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