JEE MAIN - Physics (2013 (Offline) - No. 14)
Statement - $${\rm I}$$ : Higher the range, greater is the resistance of ammeter.
Statement - $${\rm I}$$$${\rm I}$$ : To increase the range of ammeter, additional shunt needs to be used across it.
Statement - $${\rm I}$$$${\rm I}$$ : To increase the range of ammeter, additional shunt needs to be used across it.
Statement - $${\rm I}$$ is true, Statement - $${\rm II}$$ is true, Statement - $${\rm II}$$ is the correct explanation of statement - $${\rm I}$$.
Statement - $${\rm I}$$ is true, Statement - $${\rm II}$$ is true, Statement - $${\rm II}$$ is not the correct explanation of statement - $${\rm I}$$.
Statement - $${\rm I}$$ is true, Statement - $${\rm II}$$ is false
Statement - $${\rm I}$$ is false, Statement - $${\rm II}$$ is true
Explanation
Statements $${\rm I}$$ is false and Statement $${\rm I}$$$${\rm I}$$ is true
For ammeter, shunt resistance, $$S = {{{{\rm I}_g}G} \over {{\rm I} - {{\rm I}_g}}}$$
Therefore for $${\rm I}$$ to increase, $$S$$ should decrease, So additional $$S$$ can be connected across it.
For ammeter, shunt resistance, $$S = {{{{\rm I}_g}G} \over {{\rm I} - {{\rm I}_g}}}$$
Therefore for $${\rm I}$$ to increase, $$S$$ should decrease, So additional $$S$$ can be connected across it.
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