Two point charges +9e and +e are at 16 cm away from each other. Where should another charge q be placed between them so that the system remains in equilibrium
|
(a) 24 cm from +9e |
(b) 12 cm from +9e |
(c) 24 cm from +e |
(d) 12 cm from +e |
(b) 12 cm from +9e
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If the energy of a hydrogen atom in nth orbit is 
, then energy in the nth orbit of a singley ionized helium atom will be
|
(a) 4
|
(b) 
|
(c) 2
|
(d) 
|
In a common base amplifier circuit, calculate the change in base current if that in the emitter current is 2 mA and a = 0.98
|
(a) 0.04 mA |
(b) 1.96 mA |
(c) 0.98 mA |
(d) 2 mA |
A motor having an armature of resistance 2Ω is designed to operate at 220 V mains. At full speed, it develops a back e.m.f. of 210V. When the motor is running at full speed, the current in the armature is
|
(a) 5A |
(b) 105A |
(c) 110A |
(d) 215A |