The outer sphere of a spherical air capacitor is earthed. For increasing its capacitance
|
(a) Vacuum is created between two spheres |
|
(b) Dielectric material is filled between the two spheres |
|
(c) The space between two spheres is increased |
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(d) The earthing of the outer sphere is removed |
(b) Dielectric material is filled between the two spheres
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If a ray of light goes from a rarer medium to a denser medium, will it bend towards the normal or away from it?
In the circuit shown P ≠ R, the reading of the galvanometer is same with switch S open or closed. Then
|
(a) |
(b) |
(c) |
(d) |
A solenoid has an inductance of 60 henrys and a resistance of 30 ohms. If it is connected to a 100 volt battery, how long will it take for the current to reach 
of its final value
|
(a) 1 second |
(b) 2 seconds |
(c) e seconds |
(d) 2e seconds |
The magnetic field due to a current carrying circular loop of radius 3 cm at a point on the axis at a distance of 4 cm from the centre is 54 mT. What will be its value at the centre of the loop
|
(a) 250 m T |
(b) 150 m T |
(c) 125 m T |
(d) 75 m T |
The average life T and the decay constant λ of a radioactive nucleus are related as
|
(a) T λ = 1 |
(b) T = |
(c) |
(d) T = |
