21
Question
The ammeter is designed such that the ratio of current through the coil to current through the shunt is
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Solution
The correct option is A <<1
You know very well by now that if there are two resistors connected in parallel, then the incoming current divides itself in a ratio inversely proportion to the resistance. Or in other words, more current will flow through the smaller resistor as compared to the larger one.
The shunt resistor has a very small value in order to bring down the equivalent resistance of the combination. Thus very large amount of current flows through shunt resistor as compared to the coil. Therefore, icoilishunt<<1
You know very well by now that if there are two resistors connected in parallel, then the incoming current divides itself in a ratio inversely proportion to the resistance. Or in other words, more current will flow through the smaller resistor as compared to the larger one.
The shunt resistor has a very small value in order to bring down the equivalent resistance of the combination. Thus very large amount of current flows through shunt resistor as compared to the coil. Therefore, icoilishunt<<1
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