Final answer:
The equivalent resistance of the circuit with 700Ω resistors in series is 2,800Ω.
Therefore, the correct answer is option a) 2,800Ω.
Step-by-step explanation:
To find the equivalent resistance of a circuit with resistors in series, we simply add up the individual resistances. In this case, since all the resistors have the same resistance of 700Ω, the equivalent resistance can be found by multiplying the resistance by the number of resistors.
Since there are four resistors in the circuit, the equivalent resistance would be 4 times 700Ω, which is 2800Ω. Therefore, the correct answer is option a) 2,800Ω.