11. A law establishing the fact that the algebraic su of the rises and drops of the mmf around a closed loop of a magnetic circuit is equal to zero.
Correct answer: (C)
Ampere's circuital law
12. A law relating between the magnetic and electric susceptibilities and the absolute temperatures which is followed b ferromagnets, antiferromagnets, non-polar ferroelectrics, antiferroelectrics and some paramagnets.
Correct answer: (D)
Curie-Weiss Law
13. A law stating that the magnetic susceptibilities of most paramagnetic substances are inversely proportional to their absolute temperatures.
Correct answer: (A)
Curie's Law
14. A law that states that the current in a thermionic diode varies directly with the three- halves power of anode voltage and inversely with the square of the distance between the electrodes, provided operating conditions are such that the current is limited only by the space charge.
Correct answer: (C)
Child's law
15. A law that states that the polarity of the induced voltage will oppose the change in magnetic flux causing the induction.
Correct answer: (D)
Lenz' law
16. A length of wire has a resistance of 10 ohms. What is the resistance of a wire of the same material three times as long and twice the cross-sectional area?
Correct answer: (C)
15 ohms
17. A magnetic circuit carries a flux cpi in the iron part and a flux cpg in the air gap. What is the leakage coefficient?
Correct answer: (A)
φi/ φg
18. A magnetic field is
Correct answer: (B)
The force set up when current flows through a conductor
19. A magnetic flux of 2.5 x10∧4 Wb through an area of 5 x10∧4 square meters results in
Correct answer: (B)
O.5 Tesia of flux density
20. A magnetic material losses its ferromagnetic properties at a point called
Correct answer: (A)
Curie temperature