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JEE PHYSICS MCQ: CURRENT ELECTRICITY
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Understanding
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The average drift speed of conduction electrons in copper wire of density cross sectional area, A carrying a current is
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Correct option: A
Option A is correct because the drift speed is given by the formula , where I is current, n is the number density of electrons, e is the electron charge, and A is the cross-sectional area.
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Statement-1: If a resistor is connected to a battery the current decreases when the temperature increases.
Statement-2: For most of the resistors, resistance increases with increase in temperature. The reciprocal of resistance is Corresponding to the resistance , which is order of colour coding on carbon resistors? In a meter bridge, the gaps are closed by resistance 2 and 3 ohms. The value of shunt to be added to 3 ohm resistor to shift the balancing point by is
Statement-2: For most of the resistors, resistance increases with increase in temperature. The reciprocal of resistance is Corresponding to the resistance , which is order of colour coding on carbon resistors? In a meter bridge, the gaps are closed by resistance 2 and 3 ohms. The value of shunt to be added to 3 ohm resistor to shift the balancing point by is