In Young's double slit experiment, if monochromatic light is replaced by white light
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(a) All bright fringes become white |
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(b) All bright fringes have colours between violet and red |
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(c) Only the central fringe is white, all other fringes are coloured |
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(d) No fringes are observed |
(c) Only the central fringe is white, all other fringes are coloured
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A coil of 100 turns carries a current of 5 mA and creates a magnetic flux of 10–5 weber. the inductance is
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(a) 0.2 mH |
(b) 2.0 mH |
(c) 0.02 mH |
(d) None of these |
A very long straight wire carries a current I. At the instant when a charge +Q at point P has velocity 
, as shown, the force on the charge is
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(a) Opposite to OX |
(b) Along OX |
(c) Opposite to OY |
(d) Along OY |
An electron is revolving round a proton, producing a magnetic field of 16 weber/m2 in a circular orbit of radius 1Å. It’s angular velocity will be
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(a) 1017 rad/sec |
(b) 1/2 π × 1012 rad/sec |
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(c) 2π × 1012 rad/sec |
(d) 4 π × 1012 rad/sec |
A metallic block carrying current I is subjected to a uniform magnetic induction 
as shown in the figure. The moving charges experience a force 
given by ........... which results in the lowering of the potential of the face ........ Assume the speed of the carriers to be v
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(a) eVB |
(b) eVB |
(c) -eVB |
(d) -eVB |
Assertion : An electric field is preferred in comparison to magnetic field for detecting the electron beam in a television picture tube.
Reason : Electric field require low voltage.
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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. |
In the figure a carbon resistor has bands of different colours on its body as mentioned in the figure. The value of the resistance is
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(a) 2.2 k W |
(b) 3.3 k W |
(c) 5.6 k W |
(d) 9.1 k W |
Polarising angle for water is 53°4'. If light is incident at this angle on the surface of water and reflected, the angle of refraction is
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(a) 53°4' |
(b) 126°56' |
(c) 36°56' |
(d) 30°4' |
Sixty-four drops are jointed together to form a bigger drop. If each small drop has a capacitance C, a potential V, and a charge q, then the capacitance of the bigger drop will be
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(a) C |
(b) 4C |
(c) 16C |
(d) 64C |
