Four equal-value resistors are connected in parallel. Ten volts are applied across the parallel circuit and 2 mA are measured from the source. The value of each resistor is
A. 12.5 Ω
B. 200 Ω
C. 20 kΩ
D. 50 Ω
Answer: Option C
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When a 1.6 kΩ resistor and a 120 Ω resistor are connected in parallel, the total resistance is
A. Greater than 1.6 kΩ
B. Greater than 120 Ω but less than 1.6 kΩ
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R=v/i
=10/2^-3
R total=5kohm
4 equal resisters connected in parallel
So 1/Rt=1/r+1/r+1/r+1/r
1/Rt=4/r
So Rt=r/4
r=4Rt.
r=4×5ohm=20 ohm
Pls explain this