31. Substances which have permeability less than the permeability of free space are known as A. Ferromagnetic B. Paramagnetic C. Diamagnetic D. Bipolar Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
32. A square cross-sectional magnet has a pole strength of 1 x 10 Wb and cross sectional area of 20 mm x 20 mm. What is the strength at a distance of 100 mm from the unit pole in air ? A. 63.38 N/Wb B. 633.8 N/Wb C. 6338 N/Wb D. 63380 N/Wb Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
33. Paramagnetic materials have relative permeability A. slightly less than unity B. equal to unity C. slightly more than unity D. equal to that ferromagnetic mate rials Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
34. In a simple magnetic field the strength of magnet flux A. is constant and has same value in energy part of the magnetic field B. increases continuously from initial value to final value C. decreases continuously from initial value to final value D. first increases and then decreases till it becomes zero Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
35. For which of the following materials the net magnetic moment should be zero? A. Diamagnetic materials B. Ferrimagnetic materials C. Antiferromagnetic materials D. Antiferrimagnetic materials Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
36. For a given wire-wound core, an increase in current through the coil A. Reverses the flux lines B. Decreases the flux density C. Increases the flux density D. Causes no change in flux density Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
37. In the left hand rule, forefinger always represents A. voltage B. current C. magnetic field D. direction of force on the conductor Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
38. The Biotsavart's law is a general modification of A. Kirchhoff's law B. Lenz's law C. Ampere's law D. Faraday's laws Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
39. What will be the current passing through the ring shaped air cored coil when number of turns is 800 and ampere turns are 3200? A. 2 B. 4 C. 6 D. 8 Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
40. Which of the following type of materials are not very important for engineering applications? A. Ferromagnetic B. Paramagnetic C. Diamagnetic D. None of the above Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
