CBSE Class 10 Answered
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Let us connect a battery of potential difference V across the terminals A and B as shown in above figure.
Let the current distribution in the resistor network be as shown in above figure.
Let us apply Kirchoff's voltage law to the loop ACDA , then we get
From above equaltion , we get ...............(1)
Let us apply Kirchoff's voltage law to the loop CBDC , then we get
From above equation , we get , ....................(2)
Let us apply Kirchoff's current law to the junction C , then we get
..........................(3)
using eqn.(2) , we rewrite eqn.(3) as ...................(4)
using eqn.(4) , we rewrite eqn.(1) as .....................(5)
If we apply Kirchoff's voltage law to the loop ADBA ( this loop is through battery ) , then we get
Hence
by substituting in eqn.(5) , we get
by substituting in eqn.(5) , we get
Current derived from battery is ,
Hence effective resistance of given network of resistors = V / i = 6 Ω