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
The range of accommodation of a normal human eye is ...
ln the diagram above, the resistor has a resistance 8 Ω while the reactances of the inductor a...
Superconductors are substances which ...
Uniform speed occurs when there is equal change of ...
Which of the following properties makes metals ideal for cooking utensils? ...
The total area under a force-velocity graph represents ...