- AMove towards A
- BMove towards B
- CMove at right angles to the line joining A and B
- DRemain at rest
Explanation:
Given that point A is at lower electric potential than point B. The electron between them on line joining will move.
We have to find where this electron moves.
Since we know that electric currents move from a higher potential or a lower potential. Also, electrons move in the direction opposite to electric current. So the electron on the line joining two points A and B will move from lower to higher potential i.e, it will move towards B.
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In hydrogen atom, electron makes transition from n=4 to n=1 level. Recoil momentum of the H atom will be
|
(a) 3.4 |
(b) 6.8 |
|
(c) 3.4 |
(d) 6.8 |
The strength of the magnetic field at a point r near a long straight current carrying wire is B. The field at a distance will be
|
(a) |
(b) |
(c) 2B |
(d) 4B |
In an electrolyte 3.2
bivalent positive ions drift to the right per second while 3.6
monovalent negative ions drift to the left per second. Then the current is
|
(a) 1.6 amp to the left |
(b) 1.6 amp to the right |
(c) 0.45 amp to the right |
(d) 0.45 amp to the left |
If two lenses of +5 diopters are mounted at some distance apart, the equivalent power will always be negative if the distance is
|
(a) Greater than 40 cm |
(b) Equal to 40 cm |
|
(c) Equal to 10 cm |
(d) Less than 10 cm |
When a magnetic field is applied in a direction perpendicular to the direction of cathode rays, then their
|
(a) Energy decreases |
|
(b) Energy increases |
|
(c) Momentum increases |
|
(d) Momentum and energy remain unchanged |
At what temperature will the resistance of a copper wire become three times its value at 0 oC (Temperature coefficient of resistance for copper = 4 × 10–3 per oC )
|
(a) 400 oC |
(b) 450 oC |
(c) 500 oC |
(d) 550 oC |
A wire has a resistance of 12 ohm. It is bent in the form of equilateral triangle. The effective resistance between any two corners of the triangle is
|
(a) 9 ohms |
(b) 12 ohms |
(c) 6 ohms |
(d) 8/3 ohms |