A frog can be deviated in a magnetic field produced by a current in a vertical solenoid placed below the frog. This is possible because the body of the frog behaves as
|
(a) Paramagnetic |
(b) Diamagnetic |
(c) Ferromagnetic |
(d) Antiferromagnetic |
(b) Diamagnetic
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The earth's magnetic induction at a certain point is 7 × 
. This is to be annulled by the magnetic induction at the centre of a circular conducting loop of radius 5 cm. The required current in the loop is
|
(a) 0.56 A |
(b) 5.6 A |
(c) 0.28 A |
(d) 2.8 A |
Three resistors each of 2 ohm are connected together in a triangular shape. The resistance between any two vertices will be
|
(a) 4/3 ohm |
(b) 3/4 ohm |
(c) 3 ohm |
(d) 6 ohm |
The dimensions of magnetic flux are
|
(a) |
(b) |
(c) |
(d) |
Equivalent capacitance between A and B is
|
(a) 8 μC |
(b) 6 μF |
(c) 26 μF |
(d) 10/3 μF |
For the study of the helical structure of nucleic acids, the property of electromagnetic radiation generally used is
|
(a) Reflection |
(b) Interference |
(c) Diffraction |
(d) Polarization |
To increase the angular magnification of a simple microscope, one should increase:
The path executed by a charged particle whose motion is perpendicular to magnetic field i
|
(a) A straight line |
(b) An ellipse |
(c) A circle |
(d) A helix |
