a) The permeability at the end of an iron rod b) The permeability almost in non-magnetised state c) The lowest permeability of iron rod d) The highest permeability of iron rod Ans: (b)
a) Increases with increasing cross-sectional area of material b) Decreases with increasing cross-sectional area of material c) Does not vary with increasing cross-sectional area of material d) Does vary from small increase in cross-sectional area of the material Ans: (b)
a) True b) False Ans: (b)
a) Core b) Air gap c) Coil d) Inductance Ans: (b)
a) Detecting the lines of magnetic flux b) Deflection of a magnetic compass needle c) Heating the surrounding air d) Touching the magnetically affected area Ans: (b)
a) It starts rotating b) It assures a position right angle to magnetic field c) It assures a position which follows a line of magnetic flux d) None of the above Ans: (c)
a) True b) False Ans: (b)
a) Electric current in electrical circuit b) Electromotive force c) Current density in conductor d) Voltage Ans: (b)
a) The strength of magnetic flux in a simple magnetic field continuously increases from initial value of final value. b) The strength of magnetic flux in a simple magnetic field continuously decreases from initial value to final value. c) The strength of magnetic flux in simple magnetic field is constant and has same value in every part of the magnetic field. d) None of the above statements is correct. Ans: (c)
a) True b) False Ans: (a)
a) A line of magnetic flux in a non-uniform field b) A line of magnetic flux which does not follow the designed path c) The mean length of a right shaped coil d) A line vertical to the flux lines Ans: (b)
a) 2I b) I/2 c) I/[ √R2 + (XL- XC )] d) I/[√(XL- XC )2 )] Ans: (b)
a) + ve to – ve plate b) – ve to + ve plate c) Between plates d) Between terminals Ans: (b)
a) 3/7I b) 3/4I c) I d) 7/3I e) 1/4I Ans: (a)
a) The voltage across each bulb is same b) The power dissipation in each bulb is not same c) The current through each bulb is same d) None of the above Ans: (c)