21. Materials subjected to rapid reversal of magnetism should have A. large area oiB-H loop B. high permeability and low hysteresis loss C. high co-ercivity and high retentivity D. high co-ercivity and low density 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
22. Hysteresis loop in case of magnetically hard materials is more in shape as compared to magnetically soft materials. A. circular B. triangular C. rectangular 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
23. The relative permeability of materials is not constant. A. diamagnetic B. paramagnetic C. ferromagnetic D. insulating 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
24. A permeable substance is one A. which is a good conductor B. which is a bad conductor C. which is a strong magnet D. through which the magnetic lines of force can pass very easily 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
25. The stray line of magnetic flux is defined as A. a line vertical to the flux lines B. the mean length of a ring shaped coil C. a line of magnetic flux in a non-uniform field D. a line of magnetic flux which does not follow the designed path 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
26. When two ends of a circular uniform wire are joined to the terminals of a battery, the field at the center of the circle A. will be zero B. will be infinite C. will depend on the amount of e.m.f. applied D. will depend on the radius of the circle 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
27. Two long parallel conductors carry 100 A. If the conductors are separated by 20 mm, the force per meter of length of each conductor will be A. 100 N B. 10 N C. 1 N D. 0.1 N 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
28. The magnetic reluctance of a material A. decreases with increasing cross sectional area of material B. increases with increasing cross-sec-tional area of material C. does not vary with increasing cross-sectional area of material D. any of the above Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
29. The left hand rule correlates to A. current, induced e.m.f. and direction of force on a conductor B. magnetic field, electric field and direction of force on a conductor C. self induction, mutual induction and direction of force on a conductor D. current, magnetic field and direction of force on a conductor 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
30. When a magnet is in motion relative to a coil the induced e.m.f. does not depend upon A. Resistance of the coil B. Motion of the magnet C. Number of turns of the coil D. Pole strength of the magnet Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
