Download App

Electromagnetic Induction — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsElectromagnetic Induction1 Mark
MCQ
The self induction takes place when magnetic flux through a coil:
  • A
    Remains steady
  • B
    Decreases
  • C
    Increases
  • D
    Either (B) or (C)
✓

Answer

  1. Either (B) or (C)

Explanation:

As per Faradays law, EMF is always directly proportional to the rate of change of magnetic flux. Therefore, electromagnetic induction takes place whenever the magnetic flux passing through the object changes.

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

Explore more

More "M.C.Q (1 Marks)" from Electromagnetic Induction→Electromagnetic Induction — all question types→Physics STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

Resistors are generally colour coded to:
→
The instantaneous magnitude of magnetic flux associated with a closed circuit of $5 \Omega$ resistance is given by $\phi_{ B }=6 t^2-5 t+1$, then magnitude of induced current (in A ) in the circuit at $t =0.25$ second is :
→

A radioactive sample has half-life of 5 years. Probability of decay in 10 years will be

(a) 100%

(b) 75%

(c) 50%   

(d) 25%
→
Identify the dimensional formula of electric current.
→
The electrostatic potential on the surface of a charged conducting sphere is 100V. Two statements are made in this regard S1 at any point inside the sphere, electric intensity is zero. S2 at any point inside the sphere, the electrostatic potential is 100V. Which of the following is a correct statement?
→
If the distance between H and Cl in HCl molecule is 1.28 A, then the value of electric dipole moment of this molecule will be (in Coulomb-meter):
→

An air bubble in sphere having 4 cm diameter appears 1 cm from surface nearest to eye when looked along diameter. If amg = 1.5, the distance of bubble from refracting surface is

(a) 1.2 cm

(b) 3.2 cm

(c) 2.8 cm

(d) 1.6 cm
→
How can the brightness of the pattern on the screen or cathode ray tube be changed?
→

Copper has face centered cubic (fcc) lattice with interatomic spacing equal to 2.54Å. The value of the lattice constant for this lattice is

(a) 1.27 Å

(b) 5.08 Å

(c) 2.54 Å   

(d) 3.59 Å
→

When an inert gas is filled in the place vacuum in a photo cell, then

(a) Photo-electric current is decreased

(b) Photo-electric current is increased

(c) Photo-electric current remains the same

(d) Decrease or increase in photo-electric current does not depend upon the gas filled
→