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What is the value of resistance for an ideal voltmeter?
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Explain the working of the n-p-n transistor in a common base configuration.
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The emf of the cell of internal resistance 1.275 Ω balances against a length of 217 cm of a potentiometer wire. Find the balancing length when the cell is shunted by a resistance of 15 Ω.
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Explain the construction and propagation of a spherical wavefront using Huygens's principle.
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What will a voltmeter of resistance 200 Ω read when connected across a cell of emf 2 V and internal resistance 2 Ω?
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The collector current in a common-emitter transistor amplifier is 4 mA. When the base current is increased by 20 µA, the collector current increases to 6 mA. The current gain is ______.
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How is a transistor biased for operating it as amplifier?
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Why does hot soap water help to remove tough stains on a fabric?
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What is magnetic hysterisis?
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State under what conditions will a charged particle moving through a uniform magnetic field travel in (i) a circular path (ii) a helical path.
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The mutual inductance of a pair of adjacent coils is 1.5 H. If the current is one coil changes from 5 A to 10 A in 0.1 s, the rate of change of magnet flux linkage is ______.
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What is the effect of decreasing the current through the potentiometer on the null point?
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Explain ferromagnetism on the basis of the domain theory.
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Explain ferromagnetism on the basis of the domain theory.
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The internal energy of one mole of argon is ______.
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A particle carrying 8 electron charges starts from rest and is accelerated through a potential difference of 9000 V. Calculate the KE acquired by it in keV.
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Explain the origin of paramagnetism on the basis of atomic structure.
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Explain the origin of paramagnetism on the basis of atomic structure.
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Derive an expression for the electric potential at a point due to a short electric dipole. Hence, write the expression for the electric potential at a point (i) dipole axis and (ii) on the dipole equator.
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