ELECTROSTATICS

Objective Questions Short notes Objective questions (Answers are given below) The unit of absolute permittivity of a medium is(a) joule/coulomb(b) newton-metre(c) farad/metere(d) farad/coulomb If relative permittivity of mica is 5, its absolute permittivity is(a) 5 ε0 (b) 5/ε0(b) 5/ε0 (c) ε0/5 (d) 8.854 × 10−12 Two similar electric charges of 1 C each are placed … Read more

WORK, POWER AND ENERGY

Objective Questions Short notes Objective questions (Answers are given below) If a 220 V heater is used on 110 V supply,heat produced by it will be —— as much.(a) one-half (b) twice(c) one-fourth (d) four times For a given line voltage, four heating coilswill produce maximum heat when connected(a) all in parallel (b) all in … Read more

Current Electricity Notes

What is electron drift velocity ? Electron Drift Velocity : Suppose that in a conductor, the number of free electrons available per m3 of the conductor material is n and let their axial drift velocity be ν metres/second. In time dt, distance travelled would be ν × dt. If A is area of cross-section of … Read more

Provision and Reserves

Difference between Provision and Reserves Provisions                There are certain expenses/losses which are related to the current accounting period but amount of which is not known with certainty because they are not yet incurred. It is necessary to make provision for such items for ascertaining true net profit Depreciation bad and doubtful debts taxation discount … Read more