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Assertion : Magnetism is relativistic.
Reason : When we move along with the charge so that there is no motion relative to us, we find no magnetic field associated with the charge.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
A pendulum bob of mass 30.7 and carrying a charge
is at rest in a horizontal uniform electric field of 20000 V/m. The tension in the thread of the pendulum is (g = 9.8
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(a) 3 |
(b) 4 |
(c) 5 |
(d) 6 |
The intensity of X-rays from a Coolidge tube is plotted against wavelength as shown in the figure. The minimum wavelength found is
and the wavelength of the
line is
. As the accelerating voltage is increased

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(a) ( |
(b) ( |
(c) |
(d) |
Consider an extended object immersed in water contained in a plane trough. When seen from close to the edge of the trough the object looks distorted because: