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Determine the series limit of Balmer, Paschen and Brackett series, given the limit for Lyman series is 911.6 Å.
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Explain the working of the n-p-n transistor in a common base configuration.
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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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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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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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In a CE amplifier, the current gain is 80 and the emitter current is 9 mA. The base current is ______.
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What is a photocell or photoelectric cell?
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Describe its construction and working with a neat labelled diagram.
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Find the wavelength and wave number of the first member of the Balmer series in Hydrogen spectrum. (`R =1.097xx10^7m^(-1)`)
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A rectangular coil of wire 50 turn each of area 6 x 10-4 m2 is freely suspended in a field of 3 x 10-2 Wb / m2. Calculate the current flowing through the coil when it deflects through 60°, when torsional constant is 3.82 x 10-6 SI unit.
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