A thin spherical conducting shell of radius R has a charge q. Another charge Q is placed at the centre of the shell. The electrostatic potential at a point p a distance 
from the centre of the shell is
|
(a) |
(b) |
(c) |
(d) |
(d) 
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Assertion : The magnetic filed at the ends of a very long current carrying solenoid is half of that at the center.
Reason : If the solenoid is sufficiently long, the field within it is uniform.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
The charge on a particle Y is double the charge on particle X. These two particles X and Y after being accelerated through the same potential difference enter a region of uniform magnetic field and describe circular paths of radii 
and 
respectively. The ratio of the mass of X to that of Y is
|
(a) |
(b) |
(c) |
(d) |
Kinetic energy of an electron accelerated in a potential difference of 100 V is
|
(a) 1.6 |
(b) 1.6 |
(c) 1.6 |
(d) 1.6 |
Which of the following is not a correct statement
|
(a) Resistivity of electrolytes decreases on increasing temperature |
|
(b) Resistance of mercury falls on decreasing its temperature |
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(c) When joined in series a 40 W bulb glows more than a 60 W bulb |
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(d) Resistance of 40 W bulb is less than the resistance of 60 W bulb |
The neutral temperature of a thermocouple is 350℃ when the cold junction is at 0℃ When the cold junction is immersed in a bath of 30℃, the inversion temperature is
|
(a) 700℃ |
(b) 600℃ |
(c) 350℃ |
(d) 670℃ |
In an inductor of inductance L = 100 mH, a current of I = 10A is flowing. The energy stored in the inductor is
|
(a) 5 J |
(b) 10 J |
(c) 100 J |
(d) 1000 J |
