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(a) Explain with the help of a labelled ...

(a) Explain with the help of a labelled circuit diagram, how you will find the resistance of a combination of three resistors of resistances `R_(1),R_(2)` and `R_(3)` joined in parallel.
(b) In the diagram shown below, the cell and the ammeter both have negligible resistance. The resistors are identical.

With the switch K open, the ammeter reads 0.6A. What will be the ammeter reading when the switch is closed?

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