Identify the wrong statement in the following. Coulomb's law correctly describes the electric force that
|
(a) Binds the electrons of an atom to its nucleus |
|
(b) Binds the protons and neutrons in the nucleus of an atom |
|
(c) Binds atoms together to form molecules |
|
(d) Binds atoms and molecules together to form solids |
(b) Binds the protons and neutrons in the nucleus of an atom
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Two charges +4e and +e are at a distance x apart. At what distance, a charge q must be placed from charge +e so that it is in equilibrium
|
(a) x/2 |
(b) 2x/3 |
(c) x/3 |
(d) x/6 |
The magnetic moment of a current (i) carrying circular coil of radius (r) and number of turns (n) varies as
|
(a) 1/ r2 |
(b) 1/ r |
(c) r |
(d) r2 |
The total charge induced in a conducting loop when it is moved in magnetic field depends on
|
(a) The rate of change of magnetic flux |
(b) Initial magnetic flux only |
|
(c) The total change in magnetic flux |
(d) Final magnetic flux only |
A ray of light is incident at the glass–water interface at an angle i, it emerges finally parallel to the surface of water, then the value of 
would be
|
(a) (4/3) sin i |
(b) 1/sin i |
(c) 4/3 |
(d) 1 |
A conducting ring is placed around the core of an electromagnet as shown in fig. When key K is pressed, the ring
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(a) Remain stationary |
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(b) Is attracted towards the electromagnet |
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(c) Jumps out of the core |
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(d) None of the above |
The equivalent resistance between the points P and Q in the network given here is equal to (given r = 
)
|
(a) |
(b) 1 W |
(c) |
(d) 2 W |
To charges 
and 
are placed 30 cm apart, shown in the figure. A third charge 
is moved along the arc of a circle of radius 40 cm from C to D. The change in the potential energy of the system is 
, where k is
|
(a) 8
|
(b) 
|
(c) 
|
(d) 
|
