An object 5 cm tall is placed 1m from a concave spherical mirror which has a radius of curvature of 20 cm The size of the image is
|
(a) 0.11 cm |
(b) 0.50 cm |
(c) 0.55 cm |
(d) 0.60 cm |
(c) 0.55 cm
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A parallel plate condenser with oil between the plates (dielectric constant of oil K = 2) has a capacitance C. If the oil is removed, then capacitance of the capacitor becomes
|
(a) |
(b) 2C |
(c) |
(d) |
When a positive q charge is taken from lower potential to a higher potential point, then its potential energy will
|
(a) Decrease |
(b) Increases |
(c) Remain unchanged |
(d) Become zero |
The coil of area 0.1 m2 has 500 turns. After placing the coil in a magnetic field of strength 4
, if rotated through 90o in 0.1 s, the average emf induced in the coil is
|
(a) 0.012 V |
(b) 0.05 V |
(c) 0.1 V |
(d) 0.2 V |
A cable of resistance 10 Ω carries electric power from a generator producing 250 kW at 10000 volt. The current in the cable is
|
(a) 25 A |
(b) 250 A
|
(c) 100 A |
(d) 1000 A |
In the shown arrangement of the experiment of the meter bridge if AC corresponding to null deflection of galvanometer is x, what would be its value if the radius of the wire AB is doubled
|
(a) x |
(b) x/4 |
(c) 4x |
(d) 2x |
The resistance of a conductor increases with
|
(a) Increase in length |
(b) Increase in temperature |
|
(c) Decrease in cross–sectional area |
(d) All of these |
