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Two particles, carrying charges −q and +q and and of mass m each, are fixed at the ends of a light rod of length a to form a dipole. The rod is clamped at an end and is placed in a uniform electric field E with the axis of the dipole along the electric field. The rod is slightly tilted and then released. Neglecting gravity, find the time period of small oscillations.
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What are the advantages of using soft iron as a core, instead of steel, in the coils of galvanometers?
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A coil of radius 10 cm and resistance 40 Ω has 1000 turns. It is placed with its plane vertical and its axis parallel to the magnetic meridian. The coil is connected to a galvanometer and is rotated about the vertical diameter through an angle of 180°. Find the charge which flows through the galvanometer if the horizontal component of the earth's magnetic field is BH = 3.0 × 10−5 T.
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What do you mean by bandwidth of a signal? Give its importance.
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Differentiate between Analog and Digital communication.
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State how a moving coil galvanometer can be converted into an ammeter.
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Explain the significance of a radial magnetic field when a current-carrying coil is kept in it.
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Answer the following question.
Derive an expression for the electric field at any point on the equatorial line of an electric dipole.
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Define the term ‘current sensitivity’ of a moving coil galvanometer.
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An electric dipole is placed at an angle of 30° with an electric field intensity of 2 × 105 N/C. It experiences a torque equal to 4 Nm. The charge on the dipole, if the dipole length is 2 cm, is ______.
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A galvanometer coil has a resistance of 12 Ω and the metre shows full scale deflection for a current of 3 mA. How will you convert the metre into a voltmeter of range 0 to 18 V?
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A galvanometer coil has a resistance of 15 Ω and the metre shows full scale deflection for a current of 4 mA. How will you convert the metre into an ammeter of range 0 to 6 A?
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Work done by a uniform electric field 'E' in moving a charge 'q' at a distance 'd' from a to b is ______.
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An electric dipole is placed at an angle of 30° to a non-uniform electric field. The dipole will experience ________.
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