If the frequency of an alternating e.m.f. is f in L-C-R circuit, then the value of impedance Z $- ------- -$ as log(frequency) increases :

increases

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increases and then becomes equal to resistance, then it will start decreasing

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decreases and when it becomes minimum, equal to the resistance then it will start increasing

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go on decreasing

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Solution

The correct option is C decreases and when it becomes minimum, equal to the resistance then it will start increasing
If the frequency of an alternating e.m.f. is f in L-C-R circuit, then the value of impedance Z decreases and when it becomes minimum, equal to the resistance then it will start increasing as log(frequency) increases :

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If the frequency of an alternating e.m.f. is f in L-C-R circuit, then the value of impedance Z ––––––––– as log(frequency) increases :

If the frequency of an alternating e.m.f. is f in L-C-R circuit, then the value of impedance Z $- ------- -$ as log(frequency) increases :