Physics Circle home Student Login

Home›Chapters›Electromagnetic Induction PYQs›Combination of Inductors, LR & LC Circuits›Question 29

JEE Main 2020 (6 Sep, Shift 1) · Combination of Inductors, LR & LC Circuits

Combination of Inductors, LR & LC Circuits question from JEE Main 2020 (6 Sep, Shift 1)

Q29JEE Main 2020 · 6 SEP · SHIFT 1Medium

Combination of Inductors, LR & LC Circuits

A part of a complete circuit is shown in the figure. At some instant, the value of current I is 1A and it is decreasing at a rate

of 102 A s–1. The value of the potential difference VP – VQ, (in volts) at that instant, is _________.

Figure

Numerical answer type. Work it out, then open the answer.

Show answer and solution

Answer: 33

  1. Current flows from QQ to PP. Go from QQ to PP: VQ−IR+30−LdIdt=VPV_Q - IR + 30 - L\frac{dI}{dt} = V_P
  2. IR=1×2=2 VIR = 1\times2 = 2\text{ V}, LdIdt=0.05×(−100)=−5 VL\frac{dI}{dt} = 0.05\times(-100) = -5\text{ V}
  3. VP−VQ=−2+30+5=33 VV_P - V_Q = -2 + 30 + 5 = 33\text{ V}
Report a mistake

More questions on Combination of Inductors, LR & LC Circuits