- 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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If a 0.1 % increase in length due to stretching, the percentage increase in its resistance will be
|
(a) 0.2 % |
(b) 2 % |
(c) 1 % |
(d) 0.1 % |
For skywave propagation of a 10 MHz signal, what should be the minimum electron density in ionosphere
|
(a) ~ 1.2 |
(b) ~ |
(c) ~ |
(d) ~ |
A wave can transmit ...... from one place to another
|
(a) Energy |
(b) Amplitude |
(c) Wavelength |
(d) Matter |
The dispersive power is maximum for the material
|
(a) Flint glass |
(b) Crown glass |
(c) Mixture of both |
(d) None of the above |
A radioactive material has an initial amount 16gm. After 120 days it reduces to 1gm, then the half-life of radioactive material is
|
(a) 60 days |
(b) 30 days |
(c) 40 days |
(d) 240 days |
Coating of strontium oxide on Tungsten cathode in a valve is good for thermionic emission because
|
(a) Work function decreases |
|
(b) Work function increases |
|
(c) Conductivity of cathode increases |
|
(d) Cathode can be heated to high temperature |