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ICSE Class 10 Answered

A cell supplies a current of 0.6 A through a 2 ohm coil and a current of 0.3 A through an 8 ohm coil.Calcualte the emf and internal resistence of the cell
Asked by lovemaan5500 | 04 Jan, 2018, 07:42: PM
answered-by-expert Expert Answer
Let emf of cell be ε and internal resistace of cell is r.
 
for the 2Ω coil, 0.6×(2+r) = ε , 1.2+0.6r = ε ....................... (1)
for the 8Ω coil, 0.3×(8+r) = ε,  2.4+0.3r = ε ........................(2)
 
by equating (1) and (2) and solve for r, we get r = 4 Ω.
 
then from (1), by substituting r=4, we get emf ε = 3.6V 

Answered by | 04 Jan, 2018, 08:14: PM

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