1A current flows through an infinitely long straight wire. The magnetic field produced at a point 1 metres away from it is
|
(a) 2 |
(b) |
(c) 2 |
(d) 2π |
(c) 2
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A 36 W galvanometer is shunted by resistance of 4W. The percentage of the total current, which passes through the galvanometer is
|
(a) 8 % |
(b) 9 % |
(c) 10 % |
(d) 91 % |
The distance between charges 5 × 
and -2.7 
is 0.2 m. The distance at which a third charge should be placed in order that it will not experience any force along the line joining the two charges is
|
(a) 0.44 m |
(b) 0.65 m |
(c) 0.556 m |
(d) 0.350 m |
If m1 and m2 are the refractive indices of the materials of core and cladding of an optical fibre, then the loss of light due to its leakage can be minimised by having
|
(a) m1 > m2 |
(b) m1 < m2 |
(c) m1 = m2 |
(d) None of these |
