- ADepends on the maximum area of the capacitor.
- BDepends on the maximum resistance offered.
- CDepends on the maximum electric field.
- DDepends on the maximum current passing through the capacitor.
Explanation:
The maximum energy that can be desirably stored in a capacitor is depends on the maximum electric field that the dielectric can withstand without breaking down. Therefore, capacitors of the same type have about the same maximum energy density, i.e. joules of energy per cubic meter.
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A solenoid is 1.0 metre long and it has 4250 turns. If a current of 5.0 ampere is flowing through it, what is the magnetic field at its centre [![]()
|
(a) 5.4 |
(b) 2.7 |
|
(c) 1.35 |
(d) 0.675 |
On increasing the reverse bias to a large value in a PN-junction diode, current
| (a) Increases slowly | (b) Remains fixed |
(c) Suddenly increases |
(d) Decreases slowly |
The emf of a thermocouple, one junction of which is kept at 0℃, is given by
the Peltier co-efficient will be
|
(a) (t + 273) (a + 2bt) |
(b) (t + 273) (a – 2bt) |
|
(c) (t – 273) (a- 2bt) |
(d) (t – 273) (a – 2bt) |
Three resistors are connected to form the sides of a triangle ABC, the resistance of the sides AB, BC and CA are 40 ohms, 60 ohms and 100 ohms respectively. The effective resistance between the points A and B in ohms will be
|
(a) 32 |
(b) 64 |
(c) 50 |
(d) 200 |