A circular loop carrying a current is replaced by an equivalent magnetic dipole. A point on the axis of the loop is
|
(a) An end-on position |
(b) A broad side-on position |
|
(c) Both (a) and (b) |
(d) Neither (a) nor (b) |
(a) An end-on position
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A capacitor 4 μF charged to 50 V is connected to another capacitor of 2 μF charged to 100 V with plates of like charges connected together. The total energy before and after connection in multiples of (
is
|
(a) 1.5 and 1.33 |
(b) 1.33 and 1.5 |
(c) 3.0 and 2.67 |
(d) 2.67 and 3.0 |
Electric field and magnetic field in Thomson mass spectrograph are applied
|
(a) Simultaneously, perpendicular |
(b) Perpendicular but not simultaneously |
|
(c) Parallel but not simultaneously |
(d) Parallel simultaneously |
If two wires having resistance R and 2R. Both joined in series and in parallel then ratio of heat generated in this situation, applying the same voltage,
|
(a) 2 : 1 |
(b) 1 : 2 |
(c) 2 : 9 |
(d) 9 : 2 |
Size of nucleus is of the order of
|
(a) |
(b) |
(c) |
(d) |
Copper has face centered cubic (fcc) lattice with interatomic spacing equal to 2.54Å. The value of the lattice constant for this lattice is
|
(a) 1.27 Å |
(b) 5.08 Å |
(c) 2.54 Å |
(d) 3.59 Å |
Larger aperture of objective lens in an astronomical telescope:
A photon of 1.7 
Joules is absorbed by a material under special circumstances. The correct statement is
|
(a) Electrons of the atom of absorbed material will go the higher energy states |
|
(b) Electron and positron pair will be created |
|
(c) Only positron will be produced |
|
(d) Photoelectric effect will occur and electron will be produced |
