- AIncreases towards the centre.
- BDecreases towards the centre.
- CIs finite and constant throughout.
- DIs zero.
Explanation:
As there are no charges inside the hollow conducting sphere, as all charges reside on it surface. So, electric field inside the hollow conducting sphere is zero.
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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 |
Two coaxial solenoids 1 and 2 of the same length are set so that one is inside the other. The number of turns per unit length are and
. The currents
and
are flowing in opposite directions. The magnetic field inside the inner coil is zero. This is possible when
|
(a) |
(b) |
|
(c) |
(d) |
The fact that electric charges are integral multiples of the fundamental electronic charge was proved experimentally by
|
(a) Planck |
(b) J.J. Thomson |
(c) Einstein |
(d) Millikan |
Assertion : The ion cannot move with a speed beyond a certain limit in a cyclotron.
Reason : As velocity increases time taken by ion increases.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
The capacitance of a parallel plate condenser does not depend on
|
(a) Area of the plates |
(b) Medium between the plates |
|
(c) Distance between the plates |
(d) Metal of the plates |
In a step up transformer, if ratio of turns of primary to secondary is 1 : 10 and primary voltage is 230 V. If the load current is 2A, then the current in primary is
|
(a) 20 A |
(b) 10 A |
(c) 2 A |
(d) 1 A |
In Young’s double slit experiment, the aperture screen distance is 2m. The fringe width is 1 mm. Light of 600 nm is used. If a thin plate of glass (m = 1.5) of thickness 0.06 mm is placed over one of the slits, then there will be a lateral displacement of the fringes by
|
(a) 0 cm |
(b) 5 cm |
(c) 10 cm |
(d) 15 cm |
$\text{v}=\frac{\text{v}_1+\text{v}_2}{2}$
$\text{v}=\sqrt{\text{v}_1\text{v}_2}$
$\frac{2}{\text{v}}=\frac{1}{\text{v}_1}+\frac{1}{\text{v}_2}$
$\frac{1}{\text{v}}=\frac{1}{\text{v}_1}+\frac{1}{\text{v}_2}$
A
at rest decays into 2γ rays
. Then which of the following can happen
|
(a) The two |
|
(b) The two |
|
(c) Both repel each other |
|
(d) Both attract each other |