A wire is stretched to n times its length. Then the resistance now will increase by :
M = constant
The correct answer is: n^{2} times
A cell has an emf 1.5 V when connected across in an external resistance of 2Ω the terminal potential difference falls to 1.0 V. The internal resistance of the cell is :
Internal resistance of the cell is given by
The correct answer is: 1.0Ω
n equal cell having e.m.f. E and internal resistance r, are connected in circuit of a resistance R. Same current flows in circuit either they connected in series or parallel, if :
Current when cells are connected in series
The correct answer is: R = r
The potential difference between point A and B is :
A wire is bent in the form of a triangle now the equivalent resistance between its one end and the mid point of the side is :
Resistance R, R and R/2 are in series. Their resultant resistance.
Resistance R' and R/2 are in series. Their resultant resistance
There is a voltmeter in a circuit. In order to triple its range, the resistance of how much value should be used?
If R is the resistance of the voltmeter and I current is flowing through it, then
The correct answer is: 2R
Nine resistors each of resistance R are connected in the circuit as shown in figure. The net resistance between A and B is
The correct answer is: 2R/9
The resistance of an ammeter is 13Ω and its scale is graduated for a current upto 100 A. After an additional shunt has been connected to this ammeter it becomes possible to measure currents upto 750 A by this meter. The value of shunt resistance is :
The potential differences across ammeter and shunt is same. Let i_{a} is the current flowing through ammeter and i is the total current. So, a current i  i_{a} will flow through. shunt resistance.
The correct answer is: 2Ω
The value of i_{1}/i_{2} for a given diagram is :
When a wire of uniform crosssection a length ℓ and resistance R is bent into a complete circle, resistance between two of diametrically opposite points will be :
When wire is bent to form a complete circle then
Resistance of each semicircle
Thus, net resistance is parallel combination of two semicircular resistances
The correct answer is: R/4
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