In a Wheatstone Bridge, the ammeter reads zero, and the variable resistor is adjusted to 5 ohms. Resistor P has a value of 10 ohms and Q has a value of 100 ohms. What is the value of the unknown resistor?
- 0.5 ohms.
- 5 ohms.
- 50 ohms.
Explanation from PART66Online
At balance, P/Q = R/X, so the unknown X = R x (Q/P) = 5 x (100/10) = 50 ohms. The 0.5-ohm option inverts the arm ratio; 5 ohms ignores it entirely.
P
pB1B2 asked · 29 Jan 2017
how?
Community Comments (1)
A
Alekrg
19 Apr 2017
Since there is not any electrical diagram the correct answer could be either B and C
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