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NEET UG PHYSICS MCQ: ALTERNATING CURRENT
1
Medium
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Understanding
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When power is drawn from the secondary coil of the transformer, the dynamic resistance
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Correct option: A
Increases
Option A (Increases) is correct because when power is drawn, the current in the secondary coil increases, which reflects as an increased load on the primary side, effectively increasing the dynamic resistance.
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Assertion (A) : In an circuit, potential difference across the capacitor may be greater than the applied voltage.
Reason (R) : , whereas and can be greater than also. An alternating e.m.f. is applied to purely capacitive circuit. The phase relation between e.m.f. and current flowing in the circuit is or
In a circuit containing capacitance only
Average power in the L-C-R circuit depends upon A generator produces a voltage that is given by , where t is in seconds. The frequency and r.m.s. voltage are In a choke coil, the resistance and resistance are such that Assertion: With increase in frequency of an A.C supply, the impedance of an L-C-R series circuit, decreases at first, becomes minimum and then increases.
Reason: In L-C-R series circuit, impedance (z)
.
Reason (R) : , whereas and can be greater than also. An alternating e.m.f. is applied to purely capacitive circuit. The phase relation between e.m.f. and current flowing in the circuit is or
In a circuit containing capacitance only
Average power in the L-C-R circuit depends upon A generator produces a voltage that is given by , where t is in seconds. The frequency and r.m.s. voltage are In a choke coil, the resistance and resistance are such that Assertion: With increase in frequency of an A.C supply, the impedance of an L-C-R series circuit, decreases at first, becomes minimum and then increases.
Reason: In L-C-R series circuit, impedance (z)
.