22. If Is and pr are the absolute and relative magnetic permeabilities of a medium and Ito is the absolute permeability of free space, then

A. VI )10FLT r

B. VI )10FLT r

C. VI )10FLT r

D. VI )10FLT r

23. Force F eperienced by a charge q placed in static electic field of intensity E is given

A.

B.

C.

D.

24. Displacement density D and electric field strength E are related by

A. D

B. D = E/E

C. D = eE2

D. none of these

25. The following law relates the forces experienced by two loops of wires carrying current

A. Coulomb's law

B. Ampere's law

C. Newton's law

D. Laplace Equation

26. Maxwell's divergence equation in case of static electric field states that

A. V.E = -2?E

B. V.E = Ep

C. V.E = Ep

D. V.E = Ep

27. Maxwell's curls equation for static magnetic field is given by

A. V.B = po1

B. V.13 =0

C. V.8 = p0J

D. V.8 = po/J

28. Hysteresis losses

A. generally increase with direct current in a coil

B. are caused by high frequency currents

C. can not be produced in an iron core because it is a conductor

D. not of these

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