In the arrangement shown, initially switch S is open and reading of the ammeter is 2.5 A. What will be the reading of the ammeter after the switch S is closed?
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a
5 Amp
b
Zero
c
7.5 Amp
d
1.25 Amp
answer is A.
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Detailed Solution
Initially i1=12R=5R AmpAfter S is closed, i2=10R=105i1=2i1=2×2.5 Amp ⇒i2=5 Amp.