MHT CET 2026 Physics question
A series combination of resistor 'R' and capacitor 'C' is connected to an a.c. source of angular frequency ''. Keeping the voltage same, if the frequency is changed to the current becomes half of the original current. Then the ratio of capacitive reactance and resistance is
Answer: (D)
Solution
Let the initial capacitive reactance be . The initial impedance is . At frequency the reactance becomes , so . With the same voltage, ; the current halves, so $ =
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