- AAttractive
- BRepulsive
- CBoth attractive and repulsive
- DNeither attractive nor repulsive
Explanation:
If electric current in two long straight conductors is in mutually opposite directions, the magnetic force acting between them will be repulsive.
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At a place, the horizontal and vertical intensities of earth's magnetic field is 0.30 Gauss and 0.173 Gauss respectively. The angle of dip at this place is
| (a) 30° | (b) 90° | (c) 60° | (d) 45° |
In vacuum an electron of energy 10 keV hits tungsten target, then emitted radiation will be
|
(a) Cathode rays |
(b) X-rays |
(c) Infrared rays |
(d) Visible spectrum |
If all the resistors shown have the value 2 ohm each, the equivalent resistance over AB is
|
(a) 2 ohm |
(b) 4 ohm |
(c) 1 |
(d) 2 |
Two lenses of power 6D and – 2D are combined to form a single lens. The focal length of this lens will be
|
(a) |
(b) |
(c) 4 m |
(d) |
The capacities and connection of five capacitors are shown in the adjoining figure. The potential difference between the points A and B is 60 volts . Then the equivalent capacity between A and B and the charge on 5μF capacitance will be respectively

|
(a) 44 μF, 300 μC |
(b) 16 μF, 150 μC |
(c) 15 μF, 200 μC |
(d) 4 μF, 50 μC |
The transition from the state n = 4 to n = 3 in a hydrogen-like atom results in ultraviolet radiation. Infrared radiation will be obtained in the transition
|
(a) 2 → 1 |
(b) 3 → 2 |
(c) 4 → 2 |
(d) 5 → 4 |
Assertion : In Hertz experiment, the electric vector of radiation produced by the source gap is parallel to the gap.
Reason : Production of sparks between the detector gap is maximum when it is placed perpendicular to the source gap.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |