Three equal capacitors, each with capacitance C are connected as shown in figure. Then the equivalent capacitance between A and B is
|
(a) C |
(b) 3C |
(c) |
(d) |
(b) 3C
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One metre length of wire carries a constant current. The wire is bent to form a circular loop. The magnetic field at the centre of this loop is B. The same is now bent to form a circular loop of smaller radius to have four turns in the loop. The magnetic field at the centre of this new loop is
|
(a) 4 B |
(b) 16 B |
(c) B/2 |
(d) B/4 |
When the light source is kept 20 cm away from a photo cell, stopping potential 0.6 V is obtained. When source is kept 40 cm away, the stopping potential will be
|
(a) 0.3 V |
(b) 0.6 V |
(c) 1.2 V |
(d) 2.4 V |
The plane faces of two identical plano-convex lenses each having focal length of 40 cm are pressed against each other to form a usual convex lens. The distance from this lens, at which an object must be placed to obtain a real, inverted image with magnification one is
|
(a) 80 cm |
(b) 40 cm |
(c) 20 cm |
(d) 162 cm |
A neon sign does not produce
|
(a) Line spectrum |
(b) An emission spectrum |
|
(c) An absorption spectrum |
(d) Photons |
