A) measure the current passing through electric bulb.
B) measure the weak current received through lengthy submarine cable.
C) measure current passing through human body.
D) all of these.
Correct Answer: B
Solution :
Option [b] is correct Explanation: The fundamental problem was that the transmitting/receiving a signal through a lengthy submarine cable was very low. Instead of increasing the magnitude of the current transmission. Lord Kelvin modified the existing galvanometer so that it became capable to measure the weakest current.
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