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Answer the following question in detail.
What is the limitation in increasing the magnifying powers of a compound microscope?
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Answer the following question in detail.
What is the limitation in increasing the magnifying powers of the astronomical telescope?
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Answer the following question.
What is the unit of dipole moment?
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Answer briefly.
What is the modulation?
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What is meant by amplitude modulation?
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What is demodulation?
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What type of modulation is required for television broadcast?
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Why does amplitude modulation give noisy reception?
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Answer briefly.
Explain why is modulation needed.
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(a) A conductor A with a cavity as shown in Fig (a) is given a charge Q. Show that the entire charge must appear on the outer surface of the conductor.
(b) Another conductor B with charge q is inserted into the cavity keeping B insulated from A. Show that the total charge on the outside surface of A is Q + q [Fig. (b)].
(c) A sensitive instrument is to be shielded from the strong electrostatic fields in its environment. Suggest a possible way.
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Answer the following question.
State the units of linear charge density.
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Two charges 5 μC and -4μC are kept 5.0 m apart at points A and B respectively. How much work will have to be done to move the charge at A through a distance of 5.0 m further away from point B along the line BA?
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Answer the following question.
While rotating an object or while opening a door or a water tap we apply a force or forces. Under which conditions is this process easy for us? Why? Define the vector quantity concerned. How does it differ for a single force and for two opposite forces with different lines of action?
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Answer the following question.
Why is the moment of a couple independent of the axis of rotation even if the axis is fixed?
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Answer the following question.
Explain the term 'steady state'.
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Answer the following question.
Define coefficient of thermal conductivity.
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Derive its expression for the coefficient of thermal conductivity.
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Answer the following question.
Give any four applications of thermal conductivity in everyday life.
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Answer the following question.
Explain the term thermal resistance. State its SI unit and dimensions.
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Answer the following question.
How heat transfer occurs through radiation in absence of a medium?
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