One metallic sphere A is given positive charge whereas another identical metallic sphere B of exactly same mass as of A is given equal amount of negative charge. Then
|
(a) Mass of A and mass of B still remain equal |
|
(b) Mass of A increases |
|
(c) Mass of B decreases |
|
(d) Mass of B increases |
(d) Mass of B increases
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
The dimension of (1/2) 
: permittivity of free space; E : electric field) is
|
(a) |
(b) |
(c) |
(d) |
Assertion : Magnetism is relativistic.
Reason : When we move along with the charge so that there is no motion relative to us, we find no magnetic field associated with the charge.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
A 40 mF capacitor in a defibrillator is charged to 3000 V. The energy stored in the capacitor is sent through the patient during a pulse of duration 2ms. The power delivered to the patient is
|
(a) 45 kW |
(b) 90 kW |
(c) 180 kW |
(d) 360 kW |
5 cm long solenoid having 10 ohm resistance and 5 mH inductance is joined to a 10 volt battery. At steady state the current through the solenoid in ampere will be
|
(a) 5 |
(b) 1 |
(c) 2 |
(d) Zero |
If the energy released in the fission of one nucleus is 200 MeV. Then the number of nuclei required per second in a power plant of 16 kW will be
|
(a) 0.5 |
(b) 0.5 |
(c) 5 |
(d) 5 |
