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NEET
Exam
NEET
Subject
Physics
Chapter
Alternating Current

NEET · Physics · Alternating Current

Given below are two statements: Statement I: Maximum power is...

Given below are two statements:

Statement I: Maximum power is dissipated in a circuit containing an inductor, a capacitor and a resistor connected in series with an ACAC source, when resonance occurs.

Statement II: Maximum power is dissipated in a circuit containing pure resistor due to zero phase difference between current and voltage.

In the light of the above statements, choose the correct answer from the options given below:

Options

  1. AStatement II is false but Statement IIII is true
  2. BBoth Statement II and Statement IIII are true
  3. CStatement II is true but Statement IIII is false
  4. DBoth Statement II and Statement IIII are false

Correct answer

B. Both Statement II and Statement IIII are true

Step-by-step solution

The formula for impedance is given by 

Z=R2+(XL−XC)2Z = \sqrt{{R}^{2} + {\left({X}_{L} - {X}_{C}\right)}^{2}}

At resonance, XL=XC{X}_{L} = {X}_{C}. So, {Z}_\min = R

Power will be maximum when impedance is minimum. Thus the maximum power occurs in a purely resistive circuit. 

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