MCQ
Through a semiconductor, an electric current is due to drift of
- AFree electrons
- ✓Free electrons and holes
- CPositive and negative ions
- DProtons
✓
Answer
Correct option: B.
Free electrons and holes
b
(b) In semiconductors charge carries are free electrons and holes
(b) In semiconductors charge carries are free electrons and holes
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Find the power of the circuit
The expression for the capacity of the capacitor formed by compound dielectric placed between the plates of a parallel plate capacitor as shown in figure, will be (area of plate $ = A$)
→A thin lens is made with a material having refractive index $\mu=1.5.$ Both the sides are convex. It is dipped in water $(\mu=1.33).$ It will behave like:
→An electron is moving along positive x-axis. To get it moving on an anticlockwise circular path in x-y plane, a magnetic filed is applied
The earth’s magnetic field at a given point is $0.5 \times {10^{ - 5}}\,Wb{\rm{ - }}{m^{ - 2}}$. This field is to be annulled by magnetic induction at the center of a circular conducting loop of radius $5.0\,cm$. The current required to be flown in the loop is nearly......$A$
→Assertion : A loosely round helix made of stiff wire is suspended vertically with the lower end just touching a dish of mercury. When a current is passed through the wire, the helical wire executes oscillatory motion with the lower end jumping out of and inside of mercury.
Reason : When electric current is passed through helix, a magnetic field is produced both inside and outside the helix.
Reason : When electric current is passed through helix, a magnetic field is produced both inside and outside the helix.
$0.2\,F$ capacitor is charged to $600\,V$ by a battery. On removing the battery, it is connected with another parallel plate condenser of $1\,F$. The potential decreases to.........$volts$
→A temporary magnet is made of:
The spectrum of radiation $1.0 \times 10^{14} \mathrm{~Hz}$ is in the infrared region. The energy of one photon of this in joules will be
→A ring of charge with radius $0.5\, m$ having a $0.02\, m$ gap, carries a charge of $+1\, C$. The field at the centre is
→