Electric lines of force about negative point charge are
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(a) Circular, anticlockwise |
(b) Circular, clockwise |
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(c) Radial, inward |
(d) Radial, outward |
Electric lines of force about negative point charge are
|
(a) Circular, anticlockwise |
(b) Circular, clockwise |
|
(c) Radial, inward |
(d) Radial, outward |
(c) Radial, inward
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One conducting U tube can slide inside another as shown in figure, maintaining electrical contacts between the tubes. The magnetic field B is perpendicular to the plane of the figure. If each tube moves towards the other at a constant sped v then the emf induced in the circuit in terms of B, l and v where l is the width of each tube, will be

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(a) Zero |
(b) 2 Blv |
(c) Blv |
(d) -Blv |
An electric dipole is placed in an electric field generated by a point charge
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(a) The net electric force on the dipole must be zero |
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(b) The net electric force on the dipole may be zero |
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(c) The torque on the dipole due to the field must be zero |
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(d) The torque on the dipole due to the field may be zero |
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. |