Resistances n, each r Ω, when connected in parallel give an equivalent resistance of R Ω. If these resistances were connected in series, the combination would have a resistance in ohm, equal to
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In potentiometer experiment, a cell of emf 1.25V gives balancing length of 30 cm. If the cell is replaced by another cell, then balancing length is found to be 40cm. What is the emf of […]
The electric resistance of a certain wire of iron is R. If its length and radius are both doubled, then
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(a) The resistance will be doubled and the specific resistance will be […]
An electron in potentiometer experiences a force 2.4×10⁻¹⁹N. The length of potentiometer wire is 6m. The emf of the battery connected across the wire is (electronic charge=1.6×10⁻¹⁹C)
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(a) 6V (b) 9V (c) […]
Kirchoff’s I law and II laws of electricity prove respectively the
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(a) Conservation of charge and energy (b) Conservation of current and energy (c) Conservation of mass and charge (d) None of […]
In Wheatstone bridge, three resistors P,Q and R are conncected in three arms in order and 4th arm of resistance s, is formed by two resistors s₁ and s₂ connected in parallel. The condition for […]
Three unequal resistors in parallel are equivalent to a resistance 1 Ω. If two of them are in the ratio 1:2 and if no resistance value is fractional, the largest of the three resistances in […]
Two resistors of resistances 2Ω and 6Ω are connected in parallel. This combination is then connected to a battery of emf 2V and internal resistance 0.5Ω. What is the current flowing through the battery?
The current in a conductor varies with time t as I=2t+3t² Where I is in amperes and t in seconds. Electric charge flowing through a section of the conductor during t=2 sec to t=3 sec […]
The temperature coefficient of a resistance wire is 0.00125 per degree. The resistance at 300 K is 1 Ω. At what temperature its resistance will be 2Ω?
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(a) 1154 K (b) 1127 K […]
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