AP EAMCET202021 Sep 2020Evening ShiftPhysicsElectromagnetic InductionActual
A current (I=10 ~A ) is passed through the part of a circuit shown in the figure. What will be the potential difference between (A ) and (B ) when (I ) is decreased at constant rate of (10^2 As ⁻¹ ) at the beginning ?
Options
- A(-7.5 ~V )
- B(3.5 ~V )
- C(-3.5 ~V )
- D(4 ~V )
Correct answer
A. (-7.5 ~V )
Step-by-step solution
The given circuit diagram is shown below, Given, (I=10 ~A ) ( d I d t =10^2 As ⁻¹ ) Induced emf across inductor coil, ( array lll & e =L d I d t =5 10⁻³ 10^2 & e =0.5 ~V array ) Applying Kirchhoff's voltage law between point (A ) and (B ). ( aligned & V_ A B +2 10-12-0.5 =0 & V_ A B +20-12.5 =0 & V_ A B +7.5 =0 & V_ A B =-7.5 ~V aligned )