A solid conducting sphere of radius R1 is surrounded by another concentric hollow conducting sphere of radius R2. The capacitance of this assembly is proportional to
|
(a) |
(b) |
(c) |
(d) |
(d) 
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Two metal spheres of capacitance 
and 
carry some charges. They are put in contact and then separated. The final charges 
and 
on them will satisfy
|
(a) |
(b) |
(c) |
(d) |
Order of q/m ratio of proton, α -particle and electron is
|
(a) e > p > α |
(b) p > α > e |
(c) e > α > p |
(d) None of these |
A current of 2 A passing through conductor produces 80 J of heat in 10 seconds. The resistance of the conductor is
|
(a) 0.5 Ω |
(b) 2 Ω |
(c) 4 Ω |
(d) 20 Ω |
A battery of internal resistance 4W is connected to the network of resistances as shown. In order to give the maximum power to the network, the value of R (in Ω) should be
|
(a) 4/9 |
(b) 8/9 |
(c) 2 |
(d) 18 |
The given figure represents a material which is
|
(a) Paramagnetic |
(b) Diamagnetic |
(c) Ferromagnetic |
(d) None of these |
The capacitor of capacitance 4 μF and 6 μF are connected in series. A potential difference of 500 volts is applied to the outer plates of the two capacitor system. The potential difference across the plates of capacitor of 4 μF capacitance is
|
(a) 500 volts |
(b) 300 volts |
(c) 200 volts |
(d) 250 volts |
There are two charges +1 microcoulombs and +5 microcoulombs. The ratio of the forces acting on them will be
|
(a) 1 : 5 |
(b) 1 : 1 |
(c) 5 : 1 |
(d) 1 : 25 |
The resultant magnetic moment of neon atom will be
|
(a) Infinity |
(b) mB |
(c) Zero |
(d) mB/2 |
