The best material for the core of a transformer is
A). Stainless steel
B). Mild steel
C). Hard steel
D). Soft iron
ANSWER: D). Soft iron
EXPLANATION:
Soft iron are ferromagnetic materials made of iron which can be magnetized and demagnetized easily. Hence the use of soft iron would allow the magnetism of the core to be changed easily lessening the amount of energy lost and increasing the efficiency of the transformer.
1. The colour of the ocean appears to be blue because the sunlight falling on it is
2. In a optical fibre cable, the signal is propagated along the
4. What is the unit of relative density?
5. Which of the following is not a valid conservation law of classical physics?
6. Which of the following is a renewable resource of energy?
7. Which of the following is an example of simple harmonic motion?
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