NEET Physics Current Electricity Questions Solved

AIIMS - 1995

The equivalent resistance of the following infinite network of resistances is 

(1) Less than 4 Ω

(2) 4 Ω

(3) More than 4 Ω but less than 12 Ω

(4) 12 Ω

(3) Similar to previous question

R=2+2+2×R2+R2R+R2=8+4R+2R

R24R8=0R=4±16+322=2±23 

R cannot be negative, hence R=2+23=5.46Ω

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