Three cells each of e.m.f 1.5 V and internal resistance 2...
Three cells each of e.m.f 1.5 V and internal resistance 2.5Ω are connected as shown in the diagram above. Find the net e.m.f and the internal resistance
1.5V, 7.50Ω
1,5V, 0.83Ω
4.5V, 7.50Ω
4.5V, 0.83Ω
Correct answer is B
Since the cells are connected in parallel the net e.m.f is that of one cell, E.
However the effective internal resistance should be added as parallel resistance.
=> 1/v + 1/25 + 1/25 + 1/25 = 1.2
∴ v = 0.83Ω
∴ Effective e.m.f and internal resistance are respectively = 1.5V and 0.83Ω
Similar Questions
Which of the following statements describes an atom accurately? i. atoms of all elements are iden...
Melting ice cools an orange drink far better than the same mass of ice-cold water because ...
A resistor with fixed resistance value is called a ...
Which of the following i. \(\beta\)-particles ii. protons iii. neutrons iv. \(\alpha\)-particl...
Which of the following is a vector? ...
Which of the following are correct of plane- polarized light? I. Plane polarization of light is t...
What is the number of neutrons in the Uranium isotope \(^{238}_{92}X\)?...
Power supply is transmitted at a very high voltage and low current in order to? ...
In an A.C circuit, the ratio of r.m.s value to peak value of current is ...