In the circuit diagram shown, the two resistance wires A and B are of same length and same material, but A is thicker than B. Which ammeter A1 or A2 will indicate higher reading for current? Give reason.
Answers
Answer:
Current in A is more than current in B
Explanation:
Resistance of a wire depends upon it's length, thickness and material.
Resistance is inversely proportional to thickness.
Here the thickness of wire A is more than B.
Thickness of A > Thickness of B
So, Resistance A < Resistance of B
(This is because resistance is inversely proportional to thickness. Which means more the thickness, lesser the resistance)
As the wires are in parallel combination, they experience same voltage.
V = Ia×Ra
Ia = V/Ra
(Ia and Ra are current and resistance of wire A)
V = Ib × Rb
Ib = V/Rb
Now if we compare the two wire's current, the resistance is in denominator. As Rb is greater than Ra then Ib will be less than Ia.
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