The relay circuit shown in Figure P13.34 has the following parameters: Agap = 0.001 m2;N =...

The relay circuit shown in Figure P13.34 has the following parameters: Agap = 0.001 m2;N = 500 turns; L = 0.02 m;μ=μ0 = 4π × 10-7(neglect the iron reluctance); k = 1,000 N/m; R = 18 Ω. What is the minimum DC supply voltage v for which the relay will make contact when the electrical switch is closed?

Figure P13.34