Magnetism And Electromagnetism Multiple Choice Questions and Answers

11.  The magnetic reluctance of a material

   A. Decreases with increasing cross sectional area of material

   B. Increases with increasing cross sectional area of material

   C. Does not to vary with increasing cross-sectional area of material

   D. Any of the above

12.  Magnetic moment is a

   A. Pole strength

   B. Universal constant

   C. Scalar quantity

   D. Vector quantity

13.  Core of an electromagnet should have

   A. Low coercivity

   B. High susceptibility

   C. Both of the above

   D. None of the above

14.  Which part of the magnetic path requires largest m.m.f.?

   A. Air gap

   B. Coil

   C. Inductance

   D. Core

15.  Strength of an electromagnet can be increased by

   A. Increasing the cross-sectional area

   B. Increasing the number of turns

   C. Increasing current supply

   D. All of the above

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