1) In the figure below , the switches S1 and S2 are closed simultaneously at t=0 and a current starts to flow in the circuit. Both the batteries have the same magnitude of the electromotive force (emf) and the polarities are as indicated in the figure. Ignore mutual inductance between the inductors. The current I in the middle wires reaches its maximum magnitude Imax at time t=τ . which of the following statements is (are) true ? A) Imax=V2R B) Imax=V4R C) τ=LRIn2 D) τ=2LRIn2 Answer: Option (B,D)Explanation:I1=VR(1−e−tRL I2=VR(1−e−tR2L) From principle of superposition, I=I1−I2⇒I=VRe−tR2L(1−e−tR2L) .......(i) I is maximum when dIdt=0 , which gives e−IR2L=12 or t=2LRIn2 Substituting this time in Eq. (i), we get Imax=V4R