The potential difference between points A and B of adjoining figure is
|
(a) |
(b) |
(c) |
(d) 2 V |
The potential difference between points A and B of adjoining figure is
|
(a) |
(b) |
(c) |
(d) 2 V |
(c)
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Electric charge is uniformly distributed along a long straight wire of radius 1mm. The charge per cm length of the wire is Q coulomb. Another cylindrical surface of radius 50 cm and length 1m symmetrically encloses the wire as shown in the figure. The total electric flux passing through the cylindrical surface is
|
(a) |
(b) |
(c) |
(d) |
The electric field near a conducting surface having a uniform surface charge density σ is given by
|
(a) |
(b) |
|
(c) |
(d) |
Taking Rydberg’s constant
first and second wavelength of Balmer series in hydrogen spectrum is
| (a) 2000 Å, 3000 Å | (b) 1575 Å, 2960 Å | (c) 6529 Å, 4280 Å | (d) 6552 Å, 4863 Å |
The ratio of the speed of the electron in the first Bohr orbit of hydrogen and the speed of light is equal to (where e, h and c have their usual meanings)
|
(a) 2πhc/ |
(b) |
(c) |
(d) 2π |
Two spherical conductors A and B of radius a and b (b > a) are placed in air concentrically B is given charge + Q coulomb and A is grounded. The equivalent capacitance of these is
|
(a) 4π |
(b) 4 π |
(c) 4 π |
(d) 4 π |
The focal length of the objective lens of a compound microscope is
|
(a) Equal to the focal length of its eye piece |
|
(b) Less than the focal length of eye piece |
|
(c) Greater than the focal length of eye piece |
|
(d) Any of the above three |
A cell of e.m.f 1.5 V having a finite internal resistance is connected to a load resistance of 2Ω. For maximum power transfer the internal resistance of the cell should be
|
(a) 4 ohm |
(b) 0.5 ohm |
(c) 2 ohm |
(d) None of these |
In the above question, the resistance between the square faces is
|
(a) 3 |
(b) 3 |
(c) 3 |
(d) 3 |