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JEE PHYSICS MCQ: CURRENT ELECTRICITY
1
Medium
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Application
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The thermo emf in volts of a certain thermocouple is found to vary with temperature difference in between the two junctions according to the relation , then the neutral temperature of thermocouple is
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Correct option: B
Option B () is correct because the neutral temperature is found by setting the derivative of the thermo emf with respect to temperature difference equal to zero and solving for the temperature.
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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