An e.m.f. of 5 volt is produced by a self inductance, when the current changes at a steady rate from 3 A to 2 A in 1 millisecond. The value of self inductance is
|
(a) Zero |
(b) 5 H |
(c) 5000 H |
(d) 5 mH |
(d) 5 mH
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
A pencil dipped partially in water appears bent because of:
Five equal resistances each of resistance R are connected as shown in the figure. A battery of V volts is connected between A and B. The current flowing in AFCEB will be
|
(a) |
(b) |
(c) |
(d) |
A parallel plate capacitor having a plate separation of 2 mm is charged by connecting it to a 300 V supply. The energy density is
|
(a) 0.01 J/m3 |
(b) 0.1 J/m3 |
(c) 1.0 J/m3 |
(d) 10 J/m3 |
Assertion : A red object appears dark in the yellow light
Reason : A red colour is scattered less
|
(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. |
The force between the plates of a parallel plate capacitor of capacitance C and distance of separation of the plates d with a potential difference V between the plates, is
|
(a) |
(b) |
(c) |
(d) |
A charged ball B hangs from a silk thread S, which makes an angle θ with a large charged conducting sheet P, as shown in the figure. The surface charge density σ of the sheet is proportional to
|
(a) sin θ |
(b) tan θ |
(c) cos θ |
(c) cos θ |
When a charge of 3 coulombs is placed in a uniform electric field, it experiences a force of 3000 Newton. Within this field, potential difference between two points separated by a distance of 1 cm is
|
(a) 10 volts |
(b) 90 volts |
(c) 1000 volts |
(d) 3000 volts |
