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Class XII Physics Current Electricity 2
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Question 1
An ammeter A of finite resistance, and a resistor R are joined in series to an ideal cell C. A potentiometer P is joined in parallel to R. The ammeter reading is I0 and the potentiometer reading is V0. P is now replaced by a voltmeter of finite resistance. The ammeter reading now is I and the voltmeter reading is V –
Question 2
The diagram beside shows a circuit used in an experiment to determine the emf and internal resistance of the cell C. A graph was plotted of the potential difference V between the terminals of the cell against the current I, which was varied by adjusting the rheostat. The graph is shown on the right; x and y are the intercepts of the graph with the axes as shown. What is the internal resistance of the cell ?
Question 3
A potential difference V exists between the ends of a metal wire of length l. The drift velocity will be doubled if -
Question 4
The length of a wire of a potentiometer is 100 cm, and the e.m.f. of its stand and cell is E volt. It is employed to measure the e.m.f. of a battery whose internal resistance is 0.5 Ω. If the balance point is obtained at λ =30 cm from the positive end, the e.m.f. of the battery is
Question 5
The thermo e.m.f. of a thermo-couple is 25 μV/°C at room temperature. A galvanometer of 40 ohm resistance, capable of detecting current as low as 10−5 A, is connected with the thermocouple. The smallest temperature difference that can be detected by this system is
Question 6
Two sources of equal emf are connected to an external resistance R. The internal resistance of the two sources are R1 and R2 (R2 > R1). If the potential difference across the source having internal resistance R2 is zero, then
Question 7
An energy source will supply a constant current into the load if its internal resistance is
Question 8
Two conductors have the same resistance a 0 ºC but their temperature coefficients of resistance are α1 and α2. The respectively temperature coefficients of their series an parallel combinations are nearly
Question 9
A cell has terminal voltage 2V in open circuit and internal resistance of the given cell is 2Ω. If 4A of current is flowing between points P and Q in the circuit and then the potential difference between P and Q is
Question 10
The charge on the capacitor of capacitance C shown in the figure below will
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Nov 27JEE & BITSAT