Which of the following is the most correct electron displacement for a nucleophilic reaction to take place?

A particle of mass m is driven by a machine that delivers a constant power k watts. If the particle starts from rest the force on the particle at time t is :

A conducting square frame of side 'a' and a long straight wire carrying current I are located in the same plane as shown in the figure. The frame moves to the right with a constant velocity 'V'. The emf induced in the frame will be proportional to :

Two similar springs P and Q have spring constants K_P and K_Q, such that K_P > K_Q. The are stretched, first by the same amount (case a,) then by the same force (case b). The work done by the springs W_P and W_Q are related as, in case (a) and case (b), respectively :

The two ends of a metal rod are matainted at temperatures 100°C and 110°C. The rate of heat flow in the rod is found to be 4.0 J/s. If the ends are maintained at temperatures 200°C and 210°C, the rate of heat flow will be :

The electeric field in a certain region is acting radially outward and is given by E = Ar.A charge contained in a shepere of radius 'a' centred at the origin of the field, will be given by :