- AStationary magnetic field
- BConduction current
- CEddy current
- DDisplacement current
Explanation:
By Maxwell
$\text{I}_\text{d}=\frac{\in\text{dE}}{\text{dt}}$
dE is electric field
Id is displacement current per unit area.
Hence changing electric field gives displacement current.
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A small sphere carrying a charge ‘q’ is hanging in between two parallel plates by a string of length L. Time period of pendulum is . When parallel plates are charged, the time period changes to T . The ratio
is equal to
|
(a) |
(b) |
(c) |
(d) None of these |
An ammeter reads upto 1 ampere. Its internal resistance is 0.81 ohm. To increase the range to 10 A the value of the required shunt is
|
(a) 0.09 W |
(b) 0.03 W |
(c) 0.3 W |
(d) 0.9 W |
The photoelectric threshold wavelength for potassium (work function being 2eV ) is
|
(a) 310 nm |
(b) 620 nm |
(c) 1200 nm |
(d) 2100 nm |
The magnetic moment of a circular coil carrying current is
|
(a) Directly proportional to the length of the wire in the coil |
|
(b) Inversely proportional to the length of the wire in the coil |
|
(c) Directly proportional to the square of the length of the wire in the coil |
|
(d) Inversely proportional to the square of the length of the wire in the coil |
The total current supplied to the circuit by the battery is
|
(a) 1 A |
(b) 2 A |
(c) 4 A |
(d) 6 A |