Explanation:
For electromagnetic waves E and B are always perpendicular to each other and perpendicular to the direction of propagation. The direction of propagation is the direction of E × B.
The direction of propagation of the wave is the direction of propagation of its energy and power.
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The amplification produced by a triode is due to the action of
|
(a) Filament |
(b) Cathode |
(c) Grid |
(d) Plate |
The half-life of radioactive Polonium (Po) is 138.6 days. For ten lakh Polonium atoms, the number of disintegrations in 24 hours is
|
(a) 2000 |
(b) 3000 |
(c) 4000 |
(d) 5000 |
The primary winding of transformer has 500 turns whereas its secondary has 5000 turns. The primary is connected to an ac supply of 20 V, 50 Hz. The secondary will have an output of
|
(a) 200 V, 50 Hz |
(b) 2 V, 50 Hz |
(c) 200 V, 500 Hz |
(d) 2 V, 5 Hz |