Objective Questions Short notes Objective questions (Answers are given below) Permanent magnets are normally made of(a) aluminium (b) wrought iron(c) cast iron (d) alnico alloys A coil of 1000 turns is wound on a core.A current of 1 A flowing through the coilcreates a core flux of 1 mWb. The energystored in the magnetic field … Read more
Objective Questions Short notes Objective questions (Answers are given below) According to Faraday’s Laws of Electromagnetic Induction, an e.m.f. is induced in a conductor whenever it (a) lies in a magnetic field(b) cuts magnetic flux(c) moves parallel to the direction of themagnetic field(d) lies perpendicular to the magnetic flux. A pole of driving point admittance … Read more
Objective Questions Short notes Objective questions (Answers are given below) A capacitor consists of two(a) insulation separated by a dielectric(b) conductors separated by an insulator(c) ceramic plates and one mica disc(d) silver-coated insulators The capacitance of a capacitor is NOTinfluenced by(a) plate thickness(b) plate area(c) plate separation(d) nature of the dielectric A capacitor that stores … Read more
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
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