Assertion : If a galvanometer is converted into an ammeter and a milliammeter, then the resistance of milliammeter is always greater than that of the ammeter Reason: It is because, the value of shunt resistance in case of a milliammeter is greater than that in case of an ammeter. The effective resistance of the parallel combination of shunt resistance and that of the galvanometer has a greater value for the milliammeter.
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Assertion: The resistance of a milliammeter is greater than that of ammeter. Reason: Shunt resistance in case of a milliammeter is more than that of ammeter. A. Both (A) and (R) are true and (R) is the correct explanation of A.
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After reading the assertion and conclusion we can conclude,
→ Both Assertion(A) and Reason(R) are true and Reason(R) is the correct explanation for A.
- It is given in assertion that if a galvanometer is converted to an ammeter and a miliammeter then the resistance of the milliammeter will always be greater than that of the ammeter. It is because the milliammeter is calculating the value with much more value than the normal ammeter and this less value is because of more shunt resistance and the effective resistance of the parallel combination of shunt resistance and that of the galvanometer has a greater value for the milliammeter.
- The reason R states that the value of shunt resistance in the case of milliammeter is more because while measuring the current in the ammeter, the current should go directly through the ammeter, therefore, the shunt resistance is high. In the case of milliammeter, the value of current is more hence the shunt resistance is also high.
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