Three long, straight parallel wires carrying current, are arranged as shown in figure. The force experienced by a 25 cm length of wire C is
|
(a) 10-3 N |
(b) 2.5 ×10-3 N |
(c) Zero |
(d) 1.5 × 10-3 N |
(c) Zero
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If 
undergoes successively 8 a-decays and 6 b-decays, then resulting nucleus is
|
(a) |
(b) |
(c) |
(d) |
When 2 amperes current is passed through a tangent galvanometer, it gives a deflection of 30o. For 60o deflection, the current must be
|
(a) 1 amp |
(b) 2 |
(c) 4 amp |
(d) 6 amp |
The diode shown in the circuit is a silicon diode. The potential difference between the points A and B will be
|
(a) 6 V |
(b) 0.6 V |
(c) 0.7 V |
(d) 0 V |
Figure shows the cross-sectional view of the hollow cylindrical conductor with inner radius 'R' and outer radius '2R', cylinder carrying uniformly distributed current along it's axis. The magnetic induction at point 'P' at a distance 
from the axis of the cylinder will be
|
(a) Zero |
(b) |
(c) |
(d) |
The current flowing in two coaxial coils in the same direction. On increasing the distance between the two, the electric current will
|
(a) Increase |
(b) Decrease |
|
(c) Remain unchanged |
(d) The information is incomplete |
Angle of a prism is 30° and its refractive index is 
and one of the surface is silvered. At what angle of incidence, a ray should be incident on one surface so that after reflection from the silvered surface, it retraces its path
|
(a) 30° |
(b) 60° |
(c) 45° |
(d) |
