- AGains protons from silk.
- BGains electrons from silk.
- CGives electrons to silk.
- DGives protons to silk.
Explanation:
Excess electrons are transferred from glass to silk when a glass rod is rubbed with silk. Hence, the glass rod becomes positive, and silk becomes negative.
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A galvanometer of 25 W resistance can read a maximum current of 6mA. It can be used as a voltmeter to measure a maximum of 6 V by connecting a resistance to the galvanometer. Identify the correct choice in the given answers
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(a) 1025 W in series |
(b) 1025 W in parallel |
(c) 975 W in series |
(d) 975 W in parallel |
$\frac{1}{2}\text{m}\omega^2\text{A}^2$
$\frac{1}{4}\text{m}\omega^2\text{A}^2$
$\text{m}\omega^2\text{A}^2$
$\text{Zero}$
The electric field due to a dipole at a distance r on its axis is
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(a) Directly proportional to |
(b) Inversely proportional to |
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(c) Directly proportional to |
(d) Inversely proportional to |
Equipotential surfaces associated with an electric field which is increasing in magnitude along the x-direction are
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(a) Planes parallel to yz-plane |
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(b) Planes parallel to xy-plane |
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(c) Planes parallel to xz-plane |
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(d) Coaxial cylinders of increasing radii around the x-axis |
Assertion : The energy (E) and momentum (p) of a photon are related by p = E/c.
Reason : The photon behaves like a particle.
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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. |