When the length of a microscope tube increases, its magnifying power:
- ADecreases
- BIncreases
- CDoes not change
- DMay decrease or increase depending on observer and place of observation.
When the length of a microscope tube increases, its magnifying power:
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A hollow conducting sphere is placed in an electric field produced by a point charge placed at P as shown in figure. Let be the potentials at points A, B and C respectively. Then
|
(a) |
(b) |
(c) |
(d) |
Curies law can be written as
|
(a) x ∝ (T - |
(b) x ∝ |
(c) x ∝ |
(d) x ∝ T |
Four charges +Q, -Q, +Q, -Q are placed at the corners of a square taken in order. At the centre of the square
|
(a) E = 0, V = 0 |
(b) E = 0, V ≠ 0 |
(c) E ≠ 0, V = 0 |
(d) E = 0, V ≠ 0 |
The ratio of electric fields on the axis and at equator of an electric dipole will be
|
(a) 1 : 1 |
(b) 2 : 1 |
(c) 4 : 1 |
(d) None of these |
The age of universe is believed to be
|
(a) 1 billion years |
(b) 10 billion years |
(c) 10-20 billion years |
(d) 1000 billion years |
When a resistance of 2 ohm is connected across the terminals of a cell, the current is 0.5 A. When the resistance is increased to 5 ohm, the current is 0.25 A. The e.m.f. of the cell is
|
(a) 1.0 V |
(b) 1.5 V |
(c) 2.0 V |
(d) 2.5 V |