Intrinsic semiconductor is electrically neutral. Extrinsic semiconductor having large number of current carriers would be
|
(a) Positively charged |
|
(b) Negatively charged |
|
(c) Positively charged or negatively charged depending upon the type of impurity that has been added |
|
(d) Electrically neutral |
(d) Electrically neutral
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A narrow electron beam passes undeviated through an electric field E = 3 
and an overlapping magnetic field B = 2 
. If electric field and magnetic field are mutually perpendicular. The speed of the electrons is
|
(a) 60 m/s |
(b) 10.3 |
(c) 1.5 |
(d) 0.67 |
A 50 volt potential difference is suddenly applied to a coil with 
henry and R = 180 ohm. The rate of increase of current after 0.001 second is
|
(a) 27.3 amp/sec |
(b) 27.8 amp/sec |
(c) 2.73 amp/sec |
(d) None of the above |
A battery of emf 10 V and internal resistance 3Ω is connected to a resistor as shown in the figure. If the current in the circuit is 0.5 A. then the resistance of the resistor will be
|
(a) 19 W |
(b) 17 W |
(c) 10 W |
(d) 12 W |
Force of attraction between two point charges Q and -Q separated by d metre is 
. When these charges are placed on two identical spheres of radius R = 0.3d whose centres are d metre apart, the force of attraction between them is
|
(a) Greater than
|
(b) Equal to
|
(c) Less than |
(d) Less than |
