IIT JEE : Electromagnetic Induction Electromagnetic Waves QUESTIONS AND ANSWERS :: part2 : 11 to 15

Following IIT JEE Entrance Multiple choice objective type questions and answers will help you in Maths, Physics and Chemistry 2024 examinations :

11.Iron core chokes are used for reducing low frequency ac because

iron core is good.

Iron core has low permeability

With iron core self inductance increases

With iron core self infuctance decreases

12.A closed circuit consists of a source of emf E and an inductor coil of inductance L, connected in series. The active resistance of whole circuit is R. At the moment t = 0, inductance of coil abruptly decreased to L/n. Then current in the circuit immediately after, is:

zero

E/R

nE/R

E/nR

13.When the current changes from +2 A to -2A in 0.05 s, an emf of 8V is induced in a coil. The coefficient of self-induction of the coil is:

0.1 H

0.2 H

0.4 H

0.8 H

14.A coil is rotated in a uniform magnetic field about an axis perpendicular to the field. The emf induced in the coil would be maximum when the plane of coil is:

parallel to field

perpendicular to field

at 450C to field

none of these

15.The voltage of domestic AC is 200 V. What does this represent?

Mean voltage

Peak voltage

Root mean voltage

Root mean square voltage

More Electromagnetic Induction Electromagnetic Waves QUESTIONS AND ANSWERS available in next pages