Section-C: Comprehension Type
Consider the circuit shown. When switch S1 is closed, let i be the current at time t, then applying Kirchhoff’s law
= time constant of circuit
When current reaches its steady value (= i0), open S1 and close S2, the current does reach to zero finally but decays exponentially. The decay equation is given as
Three identical rings move with same speed on a horizontal surface in a uniform horizontal magnetic field normal to plane of rings. The first A. slips without rolling, the second B. rolls without slipping and the third rolls with slipping.