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In a concentric cable capacitor the diameters of the inner and outer cylinders are 3 and 10 mm respectively. It εr for insulation is 3, find its capacitance per metre. | |
A. | 100 pF [Wrong Answer] |
B. | 110 pF [Wrong Answer] |
C. | 118.8 pF [Wrong Answer] |
D. | 138.8 pF [Correct Answer] |