When there is an electric current through a conducting wire along its length, then an electric field must exist
|
(a) Outside the wire but normal to it |
(b) Outside the wire but parallel to it |
|
(c) Inside the wire but parallel to it |
(d) Inside the wire but normal to it |
(c) Inside the wire but parallel to it
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Serious draw back of the semiconductor device is
|
(a) They cannot be used with high voltage |
|
(b) They pollute the environment |
|
(c) They are costly |
|
(d) They do not last for long time |
If 
is 6563 Å, then wave length of second line for Balmer series will be
|
(a) |
(b) |
(c) |
(d) None of the above |
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 induction coil works on the principle of
|
(a) Self-induction |
(b) Mutual induction |
|
(c) Ampere's rule |
(d) Fleming's right hand rule |
Three long, straight parallel wires carrying current, are arranged as shown in figure. The force experienced by a 25 cm length of wire C is
|
(a) 10-3 N |
(b) 2.5 ×10-3 N |
(c) Zero |
(d) 1.5 × 10-3 N |
In the given figure each plate of capacitance C has partial value of charge
|
(a) CE |
(b) |
(c) |
(d) |
