JEE MAIN - Physics (2019 - 9th April Morning Slot - No. 26)
A wire of resistance R is bent to form a square
ABCD as shown in the figure. The effective
resistance between E and C is :
(E is mid-point of arm CD)
_9th_April_Morning_Slot_en_26_1.png)
$${7 \over {64}}R$$
$${1 \over {16}}R$$
R
$${3 \over {4}}R$$
Explanation
$${1 \over {{R_{eq}}}} = {8 \over {7R}} + {8 \over R}$$
$${1 \over {{R_{eq}}}} = {{8 + 56} \over {7R}};{R_{eq}} = {{7R} \over {64}}$$
$${1 \over {{R_{eq}}}} = {{8 + 56} \over {7R}};{R_{eq}} = {{7R} \over {64}}$$
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