Consider the network of four resistors shown in the diagram, where R₁ = 2.00 Ω, R₂ = 5.00Ω , R3 = 1.00 Ω, and R4 =

7.00 Ω. The resistors are connected to a constant emf of magnitude V.

Part A

Find the equivalent resistance RA of the resistor network.

Part B

Two resistors of resistance R5 = 3.00Ω and R6 = 3.00Ω are added to the network, and an additional resistor of

resistance R7 = 3.00 Ω is connected by a switch, as shown in the diagram. Find the equivalent resistance RB of the

new resistor network when the switch is open.

Part C

Find the equivalent resistance Rc of the resistor network described in Part B when the switch is closed.