- AAttacks.
- BRepels.
- CBoth a and b.
- DNone.
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If
and
be the numbers of holes and conduction electrons in an extrinsic semiconductor, then
|
(a) |
|
(b) |
|
(c) |
|
(d) |
I-V characteristic of a copper wire of length L and area of cross-section A is shown in figure. The slope of the curve becomes
|
(a) More if the experiment is performed at higher temperature |
|
(b) More if a wire of steel of same dimension is used |
|
(c) More if the length of the wire is increased |
|
(d) Less if the length of the wire is increased |
The combination of capacitors with
and
is charged by connecting AB to a battery. Consider the following statements
I. Energy stored in
= Energy stored in
+ Energy stored in
II. Charge on C1 = Charge on C2 + Charge on C3
III. Potential drop across C1 = Potential drop across C2 = Potential drop across C3
Which of these is/are correct

|
(a) I and II |
(b) II only |
(c) I and III |
(d) III only |
A parallel plate capacitor is connected to a battery. The plates are pulled apart with a uniform speed. If x is the separation between the plates, the time rate of change of electrostatic energy of capacitor is proportional to
|
(a) x–2 |
(b) x |
(c) x–1 |
(d) x2 |
A 50 turns circular coil has a radius of 3 cm, it is kept in a magnetic field acting normal to the area of the coil. The magnetic field B increased from 0.10 tesla to 0.35 tesla in 2 milliseconds. The average induced e.m.f. in the coil is
|
(a) 1.77 volts |
(b) 17.7 volts |
(c) 177 volts |
(d) 0.177 volts |