Eight cells marked 1 to 8, each of emf `5 V` and internal resistance `0.2 Omega` are connected as shown. What is the reading of ideal voltmeter ?

Options

A. `40 V`
B. `20 V`
C. `5 V`
D. Zero

Answer

D

Explanation

(d) Current flowing in circuit
`i= (nE)/(nr) = (5)/(0.2) = 25 A`
Terminal potential difference across the terminals of battery numbered 8,
`V = E - ir = 5 - 25 xx 0.2 = 0`
`V = 0`
Hence, voltmeter reading is zero. So, choice (d) is correct