- AGauss Law
- BNewton’s Law
- CKirchhoff’s Law
- DBiot-Savart Law
Explanation:
In classical electrodynamics, the magnetic field given by a current loop and the electric field caused by the corresponding dipoles in sheets are very similar, as far as we are far away from the loop, which enables us to deduce Ampere’s magnetic circuital law from the Biot-Savart law easily.
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16 gm sample of a radioactive element is taken from Bombay to Delhi in 2 hour and it was found that 1 gm of the element remained (undisintegrated). Half life of the element is
|
(a) 2 hour |
(b) 1 hour |
(c) |
(d) |
A particle of charge -16 coulomb moving with velocity 10
along the x-axis enters a region where a magnetic field of induction B is along the y-axis, and an electric field of magnitude
is along the negative z-axis. If the charged particle continues moving along the x-axis, the magnitude of B is
|
(a) |
(b) |
(c) |
(d) |
$\text{E}_0\text{k}=\text{B}_0\omega$
$\text{E}_0\text{B}_0=\omega\text{k}$
$\text{E}_0\omega=\text{B}_0\text{k}$
Which of the following figure represents the variation of particle momentum and the associated de-Broglie wavelength
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(a)
|
(b)
|
(c)
|
(d)
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A neon sign does not produce
|
(a) Line spectrum |
(b) An emission spectrum |
|
(c) An absorption spectrum |
(d) Photons |
The plates of a parallel plate capacitor of capacity 50 μC are charged to a potential of 100 volts and then separated from each other so that the distance between them is doubled. How much is the energy spent in doing so
|
(a) 25 |
(b) -12.5 |
(c) -25 |
(d) 12.5 |
According to de-Broglie, the de-Broglie wavelength for electron in an orbit of hydrogen atom is 10–9 m. The principle quantum number for this electron is
|
(a) 1 |
(b) 2 |
(c) 3 |
(d) 4 |