- AA moving charge.
- BA changing electric field.
- CNone of these.
- DBoth of these.
Explanation:
A moving charge and changing electric field both produces magnetic field.
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The energy of a charged capacitor is given by the expression (q = charge on the conductor and C = its capacity)
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(a) |
(b) |
(c) 2qC |
(d) |
The resistance of 10 metre long potentiometer wire is 1ohm/meter. A cell of e.m.f. 2.2 volts and a high resistance box are connected in series to this wire. The value of resistance taken from resistance box for getting potential gradient of 2.2 millivolt/metre will be
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(a) 790 Ω |
(b) 810 Ω |
(c) 990 Ω |
(d) 1000 Ω |
Assertion : Torque on the coil is the maximum, when coil is suspended in a radial magnetic field.
Reason : The torque tends to rotate the coil on its own axis.
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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. |
Huygen wave theory allows us to know
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(a) The wavelength of the wave |
(b) The velocity of the wave |
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(c) The amplitude of the wave |
(d) The propagation of wave fronts |