Question

Find the reading of ammeter ?

Answer 1

Answer:

B) $\frac{4}{5}$Ω

Explanation:

The effective resistance of the seven resistors connected parallel to each other is found out by:-

$\frac{1}{70} +\frac{1}{70} +...+\frac{1}{70} =\frac{1}{R'}$

$\frac{7}{70} =\frac{1}{R'}$

$R'=10$Ω

I=V/R'=14/10=7/5Ω

Current divides equally in all resistors, therefore current in each resistor is 1/5Ω

Since there are 4 resistors to the left of the ammeter , current reading is $\frac{4}{5}$Ω

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