Consider the points lying on a straight line joining two fixed opposite charges. Between the charges there is
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(a) No point where electric field is zero |
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(b) Only one point where potential is zero |
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(c) Only one point where electric field is zero |
|
(d) a, b |
(d) a, b
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We use flint glass prism to disperse polychromatic light because light of different colours
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(a) Travel with same speed |
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(b) Travel with same speed but deviate differently due to the shape of the prism |
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(c) Have different anisotropic properties while travelling through the prism |
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(d) Travel with different speeds |
In a parallel plate capacitor of capacitance C, a metal sheet is inserted between the plates, parallel to them. If the thickness of the sheet is half of the separation between the plates. The capacitance will be
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(a) |
(b) |
(c) 4C |
(d) 2C |
The variation of magnetic susceptibility (x) with magnetising field for a paramagnetic substance is
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(a)
|
(b)
|
(c)
|
(d)
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Work function of a metal is 2.51 eV. Its threshold frequency is
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(a) 5.9 |
(b) 6.5 |
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(c) 9.4 |
(d) 6.08 |
Each atom of an iron bar (5cm × 1 cm × 1 cm) has a magnetic moment 1.8 
. Knowing that the density of iron is 7.78 
atomic weight is 56 and Avogadro's number is 6.02 
the magnetic moment of bar in the state of magnetic saturation will be
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(a) 4.75 |
(b) 5.74 |
(c) 7.54 |
(d) 75.4 |
Assertion : For a perfectly diamagnetic substance permeability is always one.
Reason : The ability of a material of permit the passage of magnetic lines of force through it is called magnetic permeability.
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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 assertion is false but reason is true. |
