Define moment of couple. Write its S.I unit.

Define moment of force and state its S.I unit.

(a) Define electric flux. Write its S.I. units. (b) Using Gauss's law, prove that the electric field at a point due to a uniformly charged infinite plane sheet is independent of the distance from it. (c ) How is the field directed if (i) the sheet is positively charged, (ii) negatively charged ?

(a) Define self inductance. Write its S.I. units (b) Derive and expression for self inductance of a long solenoid of length l cross-sectional area A having N number of turns.

(a) define electrie flux. Write its, S.I unit. " Gauses's law in electrostatis is true for any closed surface, no matter what its shape or size is. Justify this statement with the help of a suitable example. (b) Use Gauss's law to prove that the electric field inside a uniformly charged spherical shell is zero.

Define couple.

Define self-inductance of a coil . Write its S.I. units ?

Define self-inductance of a coil . Write its S.I. units ?

Define the activity of a radio nuclide. Write its S.I. unit. Give a plot of the activity of a radioactive species versus time. How long will a radioactive isotope, whose half life is T years, take for its activity to reduce to 1//8 th of its initial value ?

Define moment of force and its unit.

Moment of couple is called