Explanation:
There is no effect of the metal on the external electric field(thus A is incorrect) while the dielectric reduces the net electric field outside. The dielectric produces an electric field inside it due to the induced charges which is opposite to the external field. Thus EQ is reduced and B and C are also incorrect.(Note that EP is not the external field). Now as the electric field inside the conductor is zero, the field Ep is zero if X is a metallic.
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The wavelength Ka X-rays produced by an X-ray tube is 0.76 Å. The atomic number of anticathode material is
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(a) 82 |
(b) 41 |
(c) 20 |
(d) 10 |
Assertion : In practical application, power rating of resistance is not important.
Reason : Property of resistance remain same even at high temperature.
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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. |
There is an air filled 1 pF parallel plate capacitor. When the plate separation is doubled and the space is filled with wax, the capacitance increases to 2pF. The dielectric constant of wax is
|
(a) 2 |
(b) 4 |
(c) 6 |
(d) 8 |
In the Young’s double slit experiment, for which colour the fringe width is least
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(a) Red |
(b) Green |
(c) Blue |
(d) Yellow |
A plane convex lens is made of refractive index 1.6. The radius of curvature of the curved surface is 60 cm. The focal length of the lens is
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(a) 50 cm |
(b) 100 cm |
(c) 200 cm |
(d) 400 cm |