Download App

Electromagnetic Induction — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsElectromagnetic Induction1 Mark
MCQ
An e.m.f is produced in a coil, which is not connected to an external voltage source. This can be due to:
  • A
    The coil being in a time varying magnetic field.
  • B
    The coil moving in a time varying magnetic field.
  • C
    The coil moving in a constant magnetic field.
  • ✓
    All of the above.
✓

Answer

Correct option: D.
All of the above.
Solution:
Key concept: As we know whenever the number of magnetic lines of force (magnetic flux) passing through a circuit changes, an e.m.f is produced in the circuit called induced e.m.f. The induced e.m.f persists only as long as there is a change or cutting of flux.
In this problem, magnetic flux linked with the isolated coil changes when the coil is placed in the region of a time varying magnetic field, the coil moving in a constant magnetic field or in time varying magnetic field.
​​​​​​​

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

Four identical capacitors are connected as shown in diagram. When a battery of $6 V$ is connected between $A$ and $B$, the charge stored is found to be $1.5\, \mu C$. The value of ${C_1}$ is........$\mu F$
→
In the circuit diagram shown in the adjoining figure, the resultant capacitance between $P$ and $Q$ is........$\mu F$
→
Consider the following statements about sound passing through a gas.
  1. The pressure of the gas at a point oscillates in time.
  2. The position of a small layer of the gas oscillates in time.
→
The equivalent resistance of a group of resistances is $R$. If another resistance is connected in parallel to the group , its new equivalent becomes $R_1$ and if it is connected in series to the group , its new equivalent becomes $R_2$ we have :
→
In a cyclotron, the angular frequency of a charged particle is independent of
→
When an ac generator of $120\,V$ is connected in series with a capacitor and a resistor of $30\,\Omega $, the circuit carries a current $1·5\,A$. The potential difference across the capacitor will be.....$V$
→
A heater draws a current of 2A when connected to a 250V source. The rate of energy dissipation is
→
Which statement is correct
→
A rope $1\ cm$ in diameter breaks if the tension in it exceeds $500 \ N$. The maximum tension that may be given to a similar rope of diameter $2\ cm$ is :
→
A conducting circular loop is placed in $X - Y$ plane in presence of magnetic field $\overrightarrow{ B }=\left(3 t ^{3} \hat{ j }+3 t ^{2} \hat{ k }\right)$ in SI unit. If the radius of the loop is $1 m$, the induced emf in the loop, at time, $t =2\,s$ is $n \pi V$. The value of $n$ is.
→