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PHYSICS
Class 12
Conceptual Questions
Electrostatics
Q 1 The electric potential is constant throughout a given region of space. Is the electric field zero or non-zero in this region? Explain.
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Q 2 If a point charge q of mass m is released in a non-uniform electric field with field lines pointing in the same direction, will it make a rectilinear motion?
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Q 3 What is the relationship between voltage and energy? More precisely, what is the relationship between potential difference and electric potential energy?
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Q 4 Voltage is always measured between two points. Why?
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Q 5 How are the units of volt and electron volt related? How do they differ?
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Q 6 In what region of space is the potential due to a nuiform closed sphere the same as that of a point charge? In what region it differs from that of a point charge?
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Q 7 Can the potential of a non-uniformly charged sphere be the same as that of a point charge? Explain.
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Q 8 What is equipotential line and equipotential surfaces?
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Q 9 Can different equipotential lines cross each other?
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Q 10 Water has a large dielectric constant but it is rarely used in capacitors. Explain why?
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Q 11 A capacitor is connected in series with a resistor and charged. Explain why the potential difference across the resistor decreases with time during charging?
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Q 12 Sketch the graph of potential difference against time for (a) discharge of a capacitor (b) charging of a capacitor.
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Q 13 Compare the formula for capacitors in series and parallel with those for resistors in series and parallel.
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Q 14 Explain why capacitors are of little use for the storing of energy for normal domestic purposes of lightning, heating and so on.
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