Combination of Capacitors
Four capacitors each of are connected as shown. The capacitance between points and is (in )

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Answer: (c)
- Label the junctions along the row . The outer loop joins and to ; joins and .
- The two middle capacitors go : both ends at the same potential, so they hold no charge.
- The end capacitors are each between and , i.e. in parallel: .
- So the answer is (c) .