A cell gives a current of 0.15A through a resistance of 8...
A cell gives a current of 0.15A through a resistance of 8Ω and 0.3A. When the resistance is changed to 3Ω the internal resistance of the cell is
0.05Ω
1.00Ω
1.50Ω
2.00Ω
2.50Ω
Correct answer is D
The E.M.F of a circuit is given by
E=I(R+r)
Hence, E = 0.15(8+r) = 0.3(3+r)
1.2 + 0.15r = 0.9 + 0.3r
1.2 - 0.9 = 0.3r - 0.15r
0.3 = 0.15r
r = 0.30.15
r = 2Ω
I. for current amplification. II. for voltage stabilization. III. for power amplification. ...
Which of the following statement is TRUE of ultraviolet, visible and infra-red rays? ...
Which of the following is/are necessary for the production of interference with two wave trains? ...
The force per unit charge experienced at a point in a field is the ...
The wire of a platinum resistance thermometer has d resistance of 3.5Ω at 0 °C and...
Vapour is said to be saturated on top of an enclosed liquid if _________ ...