Which of the following devices does not makes use of eddy current for its action? A/An
galvanometer
speedometer
induction furnace
induction coil.
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๐๐๐ฅ๐ฏ๐๐ง๐จ๐ฆ๐๐ซ ๐ข๐ฌ ๐ ๐ฆ๐จ๐ฏ๐ข๐ง๐ ๐๐จ๐ข๐ฅ ๐ข๐ง๐ฌ๐ญ๐ซ๐ฎ๐ฆ๐๐ง๐ญ. ๐๐จ๐ง๐ ๐จ๐ ๐ญ๐ก๐ ๐๐๐จ๐ฏ๐. ๐๐จ๐ฆ๐ ๐๐ฉ๐ฉ๐ฅ๐ข๐๐๐ญ๐ข๐จ๐ง ๐จ๐ ๐๐๐๐ฒ ๐๐ฎ๐ซ๐ซ๐๐ง๐ญ ๐๐ซ๐;
(๐ญ) ๐๐ง๐๐ฎ๐๐ญ๐ข๐จ๐ง ๐.๐. ๐ฆ๐จ๐ญ๐จ๐ซ๐ฌ
(๐ฎ) ๐๐๐ฅ๐ฏ๐๐ง๐จ๐ฆ๐๐ญ๐๐ซ
(๐ฏ) ๐๐ง๐๐ฎ๐๐ญ๐ข๐จ๐ง ๐๐ฎ๐ซ๐ง๐๐ง๐๐๐ฌ
(๐ฐ) ๐๐ฎ๐ญ๐จ๐ฆ๐จ๐๐ข๐ฅ๐ ๐ฌ๐ฉ๐๐๐๐จ๐ฆ๐๐ญ๐๐ซ๐ฌ ๐.๐ญ.๐.....
๐๐จ๐ง๐ ๐จ๐ ๐ญ๐ก๐ ๐๐๐จ๐ฏ๐.
The correct answer is indeed D(induction coil). This is the reason:
1. While galvanometers don't make use of eddy currents for your basic mode of operation, eddy currents sometimes can be introduced to create a magnetic field that provides a restoring force on the needle.
2. The above reason also goes for speedometers.
3. An induction furnace however utilizes eddy currents for its operation. The principle of induction furnaces is Joule heating.
4. In contrast, eddy currents serve no purpose whatsoever in induction coils and are usually a disadvantage, as they can lead to energy losses via heating of the coil.
Thus, the most appropriate answer is D(induction coils). Thank you and God bless you.
No answer is correct all of them make use of Eddy currents for various purposes please look into it
