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Five resistances have been connected as shown in the figure. The effective resistance between A and B is
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- (14/3)Ω
- (20/3)Ω
- 14Ω
- 21Ω
Correct Option: A
It is a balanced wheatstone bridge {∵(3/4)=(6/8)}, so the 7Ω resistance is ineffective.
Equivalent resistance of 3Ω and 4Ω = 3 + 4 = 7Ω (series)
Equivalent resistance of 6Ω and 8Ω = 6 + 8 =14Ω (series)
Equivalent resistance of 7Ω and 14Ω (parallel)
| = | 7 × 14 | = | 14 | Ω |
| 7 + 14 | 3 |
