2.7 What are the electric field and potential at the
centre of a square whose diagonals are 60 cm
each when (a) charges each of 2uc are placed at
the four corners. (b) charges of + 2uc are placed
on the adjacent comers and - 4uc on other cor.
ners.
3

Most short-period comets do not have randomly oriented orbits because

Amass attached to a spring is displaced from its equilibrium position by 5cm and released. the system then oscillates in simple harmonic motion with a period of 1s. if that same mass–spring system is displaced from equilibrium by 10cm instead, what will its period be in this case? a mass attached to a spring is displaced from its equilibrium position by and released. the system then oscillates in simple harmonic motion with a period of . if that same mass–spring system is displaced from equilibrium by instead, what will its period be in this case? a) 0.5sb) 2sc) 1sd) 1.4s

In addition to gravity, what is the other predominant force that affects the motion of a pendulum?