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JEE PHYSICS MCQ: CURRENT ELECTRICITY
1
Medium
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Analyzing
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Assertion: The drift velocity of electrons in a metallic wire will decrease, if the temperature of the wire is increased.
Reason: On increasing temperature, conductivity of metallic wire decreases.
Reason: On increasing temperature, conductivity of metallic wire decreases.
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Correct option: B
If both Assertion and Reason are true but Reason is not correct explanation of Assertion.
Option B (If both Assertion and Reason are true but Reason is not correct explanation of Assertion) is correct because both the drift velocity decreases and conductivity decreases with increasing temperature, but the reason isn't the direct explanation.
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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
