Three capacitors each of capacitance 1μF are connected in parallel. To this combination, a fourth capacitor of capacitance 1μF is connected in series. The resultant capacitance of the system is
|
(a) 4μF |
(b) 2μF |
(c) |
(d) |
(d) 
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The minimum charge on an object is
|
(a) 1 coulomb |
(b) 1 stat coulomb |
|
(c) |
(d) |
If a proton and anti-proton come close to each other and annihilate, how much energy will be released
|
(a) 1.5 |
(b) 3 |
(c) 4.5 |
(d) None of these |
A voltmeter has a resistance of G ohms and range V volts. The value of resistance used in series to convert it into a voltmeter of range nV volts is
|
(a) nG |
(b) (n – 1)G |
(c) |
(d) |
A non-planar loop of conducting wire carrying a current I is placed as shown in the figure. Each of the straight sections of the loop is of length 2a. The magnetic field due to this loop at the point P (a,0,a) points in the direction
|
(a) |
(b) |
(c) |
(d) |
The reverse biasing in a PN junction diode
| (a) Decreases the potential barrier |
|
(b) Increases the potential barrier |
|
(c) Increases the number of minority charge carriers |
|
(d) Increases the number of majority charge carriers |
