1A current flows through an infinitely long straight wire. The magnetic field produced at a point 1 metres away from it is
|
(a) 2 |
(b) |
(c) 2 |
(d) 2π |
(c) 2
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AM is used for broadcasting because
|
(a) It is more noise immune than other modulation systems |
|
(b) It requires less transmitting power compared with other systems |
|
(c) Its use avoids receiver complexity |
|
(d) No other modulation system can provide the necessary bandwidth faithful transmission |
The current in the following circuit is
|
(a) |
(b) |
(c) |
(d) 1A |
The mean electric energy density between the plates of a charged capacitor is (here q = charge on the capacitor and A = area of the capacitor plate)
|
(a) |
(b) |
(c) |
(d) None of the above |
White light is incident on the interface of glass and air as shown in the figure. If green light is just totally internally reflected then the emerging ray in air contains
|
(a) Yellow, orange, red |
(b) Violet, indigo, blue |
|
(c) All colours |
(d) All colours except green |
