Two conductors made of the same material are connected across a common potential difference. Conductor A has twice the diameter and twice the length of conductor B. The power delivered to the two conductors 
and 
respectively is such that 
equals to
|
(a) 0.5 |
(b) 1.0 |
(c) 1.5 |
(d) 2.0 |
(d) 2.0
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The photoelectric threshold wavelength for potassium (work function being 2eV ) is
|
(a) 310 nm |
(b) 620 nm |
(c) 1200 nm |
(d) 2100 nm |
Motion of a moving electron is not affected by
|
(a) An electric field applied in the direction of motion |
|
(b) Magnetic field applied in the direction of motion |
|
(c) Electric field applied perpendicular to the direction of motion |
|
(d) Magnetic field applied perpendicular to the direction of motion |
A moving coil galvanometer has N number of turns in a coil of effective area A, it carries a current I. The magnetic field B is radial. The torque acting on the coil is
|
(a) |
(b) |
(c) |
(d) NABI |
In a spherical condenser radius of the outer sphere is R. The different in the radii of outer and inner sphere in x. Its capacity is proportional to
|
(a) |
(b) |
(c) |
(d) |
The mutual characteristic curves of a triode are as shown in figure. The cut off voltage for the triode is
| (a) 0 V | (b) 2 V | (c) – 4 V | (d) 6 V |
For the network shown in the figure the value of the current i is
|
(a) |
(b) |
(c) |
(d) |
