- AExist everywhere.
- BExist only in the immediate vicinity of electric charges.
- CExist only when both positive and negative charges are near one another.
- DAre imaginary.
Explanation:
Electric lines of force are imaginary.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
In nuclear reactions, we have the conservation of
|
(a) Mass only |
(b) Energy only |
|
(c) Momentum only |
(d) Mass, energy and momentum |
Plate voltage of a triode is increased from 200 V to 225 V. To maintain the plate current, change in grid voltage from 5V to 5.75 V is needed. The amplification factor is
|
(a) 40 |
(b) 45 |
(c) 33.3 |
(d) 25 |
If the energy of the photon is increased by a factor of 4, then its momentum
|
(a) Does not change |
(b) Decreases by a factor of 4 |
|
(c) Increases by a factor of 4 |
(d) Decreases by a factor of 2 |
Assuming that the dimmest visible star to the naked eye has a magnitude of about 6. Brightness of planet Venus (magnitude = – 4) w.r.t. this star is
|
(a) 10,000 times brighter |
(b) 2000 times brighter |
|
(c) 15000 times brighter |
(d) 4000 times brighter |
If a resistance is connected in parallel with the resistance R in the circuit shown, then possible value of current through R and the possible value of
will be
|
(a) |
(b) I, 2R |
(c) |
(d) |