- AThe wires attract each other.
- BThe wires repel each other.
- CThe wires experience neither attraction nor repulsion.
- DThe forces of attraction or repulsion do not depend on current direction.
Explanation:
If two parallel wires carry current in opposite directions, they repel each other whereas if two parallel wires carry current in same direction, they attract each other.
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A coil resistance 20W and inductance 5H is connected with a 100V battery. Energy stored in the coil will be
|
(a) 41.5 J |
(b) 62.50 J |
(c) 125 J |
(d) 250 J |
A condenser of capacity 50μF is charged to 10 volts. Its energy is equal to
|
(a) 2.5 |
(b) 2.5 |
(c) 5 |
(d) 1.2 |
A lens behaves as a converging lens in air and a diverging lens in water. The refractive index of the material is
|
(a) Equal to unity |
(b) Equal to 1.33 |
|
(c) Between unity and 1.33 |
(d) Greater than 1.33 |
When objects at different distances are seen by the eye, which of the following remains constant
|
(a) The focal length of the eye lens |
(b) The object distance from the eye lens |
|
(c) The radii of curvature of the eye lens |
(d) The image distance from the eye lens |