A) a small round mirror attached to a fine coil of silk-covered copper wire.
B) a long fine coil of silk-covered copper wire and a small round mirror hung by a single fibre of floss silk, with four tiny magnets cemented to its back.
C) a small round mirror attached to four tiny magnets.
D) None of the above
Correct Answer: B
Solution :
Option [b] is correct. Explanation: The mirror galvanometer consists of a long fine coil of silk-covered copper wire. In the heart of that coil, within a little air- chamber, a small round mirror is hung by a single fibre of floss silk, with four tiny magnets cemented to its back.
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