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Q.
Given below are two statements :
Statement-I : The equivalent emf of two non-ideal batteries connected in parallel is smaller than either of the two emfs.
Statement-II : The equivalent internal resistance of two non-ideal batteries connected in parallel is smaller than the internal resistance of either of the two batteries.
In the light of the above statements, choose the correct answer from the options given below.
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a
Both Statement-I and Statement-II are true
b
Statement-I is true but Statement-II is false
c
Both Statement-I and Statement-II are false
d
Statement-I is false but Statement-II is true
answer is D.
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Detailed Solution
To analyze the correctness of the statements, let's consider two non-ideal batteries connected in parallel. Each battery has an emf () and an internal resistance ().
Step 1: Equivalent EMF for Parallel Batteries
For two batteries with different emfs and internal resistances, the equivalent emf () is given by:
Since this equation is a weighted average of and , the equivalent emf lies between and . This means:
Thus, Statement-I is incorrect because it claims that is smaller than either or , which is not true.
Step 2: Equivalent Internal Resistance for Parallel Batteries
The equivalent internal resistance () for two internal resistances in parallel is:
Since the parallel combination of resistances always results in a smaller equivalent resistance than either of the individual resistances, we conclude:
Thus, Statement-II is correct.