Physics Circle home Student Login

Home›Chapters›Alternating Current PYQs›Pure R, L and C Circuits›Question 54

MHT CET 2021 (21 Sep, Shift 2) · Pure R, L and C Circuits

Pure R, L and C Circuits question from MHT CET 2021 (21 Sep, Shift 2)

Q54MHT CET 2021 · 21 SEP · SHIFT 2Easy

Pure R, L and C Circuits

The inductive reactance of a coil is RΩ\Omega. If the inductance of a coil is doubled and frequency of a.c. supply is also doubled then the new inductive reactance will be

Show answer and solution

Answer: (d)

  1. XL=2πfL∝fLX_L = 2\pi fL \propto fL
  2. XL′=2π(2f)(2L)=4XL=4RX_L' = 2\pi(2f)(2L) = 4X_L = 4R
  3. So the answer is (d) 4R4R.
Report a mistake

More questions on Pure R, L and C Circuits