Current Electricity and Electrical InstrumentHard
Question
Potential difference across the terminals of a non ideal battery is
Options
A.zero when it is short circuited
B.less than its emf when current flows from negative terminal to positive terminal inside the battery
C.zero when no current is drawn from the battery
D.greater than its emf when current flows from positive terminal to negative inside the battery.
Solution
for short circuited I = 
V = E − Ir = E −
r = 0.
when current flow from negative terminal to positive terminal
V = E − Ir which is less than
when current flow from positive terminal to negative terminal
V = E + Ir which is greater than
V = E − Ir = E −
r = 0.when current flow from negative terminal to positive terminal
V = E − Ir which is less than
when current flow from positive terminal to negative terminal
V = E + Ir which is greater than
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