- AIncreasing the distance between the plates.
- BIncreasing the thickness of the plates.
- CDecreasing the thickness of the plates.
- DDecreasing the distance between the plates.
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an isotope of thorium decays in ten stages emitting six a-particles and four b-particles in all. The end product of the decay is
|
(a) |
(b) |
(c) |
(d) |
Two bar magnets with magnetic moments 2 M and M are fastened together at right angles to each other at their centres to form a crossed system, which can rotate freely about a vertical axis through the centre. The crossed system sets in earth’s magnetic field with magnet having magnetic moment 2M making and angle q with the magnetic meridian such that
|
(a) θ = |
(b) θ = |
(c) θ = |
(d) θ = |
The magnetic induction at a point P which is distant 4 cm from a long current carrying wire is . The field of induction at a distance 12 cm from the same current would be
|
(a) 3.33 |
(b) 1.11 |
(c) 3 |
(d) 9 |
A player with 3 m long iron rod runs towards east with a speed of 30 km/hr. Horizontal component of earth's magnetic field is 4
. If he is running with rod in horizontal and vertical positions, then the potential difference induced between the two ends of the rod in two cases will be
|
(a) Zero in vertical position and 1 |
|
(b) 1 |
|
(c) Zero in both cases |
|
(d) 1 |