Question

Two different coils have self-inductance ,. The current in one coil is increased at a constant rate. The current in the second coil is also increased at the same rate. At a certain instant of time, the power given to the two coils is the same. At that time the current, the induced voltage and the energy stored in the first coil are  and  respectively. Corresponding values for the second coil at the same instant are  and   respectively. Then

(a)  

(b)  

(c)

(d) a, b, c 

Answer

(d) a, b, c 

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

A piece of wood is floating in water kept in a bottle. The bottle is connected to an air pump. Neglect the compressibility of water. When more air is pushed into the bottle from the pump, the piece of wood will float with.
  1. Larger part in the water.
  2. Lesser part in the water.
  3. Same part in the water.
  4. It will sink.

In a nuclear fission reaction

(a) Two light nuclei combine to produce a heavier nucleus

(b) A light nucleus bombarded by thermal neutrons breaks up

(c) A heavy nucleus bombarded by thermal neutrons breaks up

(d) A heavy nucleus breaks up by itself

The maximum number of possible interference maxima for slit-separation equal to twice the wavelength in Young’s double-slit experiment is

(a) Infinite

(b) Five

(c) Three

(d) Zero

A body can be negatively charged by

(a) Giving excess of electrons to it

(b) Removing some electrons from it

(c) Giving some protons to it

(d) Removing some neutrons from it

Unit of induced emf is:

A capacitor of capacity  is charged upto V volt and then connected to an uncharged capacitor of capacity  . Then final potential difference across each will be

(a)  

(b)

(c)

(d)

A rectangular coil of 20 turns and area of cross- section  25 sq cm has a resistance of 100 ohm. If a magnetic field which is perpendicular to the plane of the coil changes at the rate of 1000 Tesla per second, the current in the coil is

(a) 1.0 ampere

(b) 50 ampere

(c) 0.5 ampere

(d) 5.0 ampere

The focal length of a convex mirror is 20 cm its radius of curvature will be

(a) 10 cm

(b) 20 cm

(c) 30 cm

(d) 40 cm

The area of a coil is 500cmand the number of turns in it is 2000. It is kept perpendicular to a magnetic field of induction 4 × 10-5Wb/ m2. The coil is rotated through 180 in 0.1 second. If the resistance of the total circuit is 20Ω, then the value of the induced charge flowing in the circuit will be :

Least doped region in a transistor

(a) Either emitter or collector

(b) Base

(c) Emitter

(d) Collector