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If the resistance of the coil is 15 ohms, impedance of the coil is 25 ohms, the inductive reactance will be:
  • a)
    20 ohms
  • b)
    400 ohms
  • c)
    40 ohms
  • d)
    10 ohms
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
If the resistance of the coil is 15 ohms, impedance of the coil is 25 ...
Concept:
The impedance of the coil is given by:
Z = R + jXL
where Z = impedance
R = resistance
XL = inductive reactance
The magnitude of 'Z' is given by:
 Z=  R2 + XL2
Calculation:
Given, Z = 25Ω 
R = 15Ω 
XL2 = Z2 - R2
XL2 = 252 - 152
XL2 = 400
XL = √400
XL = 20Ω 
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If the resistance of the coil is 15 ohms, impedance of the coil is 25 ohms, the inductive reactance will be:a)20 ohmsb)400 ohmsc)40 ohmsd)10 ohmsCorrect answer is option 'A'. Can you explain this answer?
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