Question

The relay circuit shown in Eigure P14.32 has the following parameters: $A_{\text {gap }}= 0.001 \mathrm{~m}^2 ; N=500$ turns; $L=0.02 \mathrm{~m} ; \mu=\mu_0=4 \pi \times 10^{-7}$ (neglect the iron reluctance); $k=1,000 \mathrm{~N} / \mathrm{m} ; R=18 \Omega$. What is the minimum DC supply voltage υ for which the relay will make contact when the electrical switch is closed?

   The relay circuit shown in Eigure P14.32 has the following parameters: $A_{\text {gap }}= 0.001 \mathrm{~m}^2 ; N=500$ turns; $L=0.02 \mathrm{~m} ; \mu=\mu_0=4 \pi \times 10^{-7}$ (neglect the iron reluctance); $k=1,000 \mathrm{~N} / \mathrm{m} ; R=18 \Omega$. What is the minimum DC supply voltage υ for which the relay will make contact when the electrical switch is
closed?

Principles and Applications of Electrical Engineering

Giorgio Rizzoni,… 7th Edition

Chapter 14, Problem 32

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The relay circuit shown in Eigure P14.32 has the following parameters: $A_{\text {gap }}= 0.001 \mathrm{~m}^2 ; N=500$ turns; $L=0.02 \mathrm{~m} ; \mu=\mu_0=4 \pi \times 10^{-7}$ (neglect the iron reluctance); $k=1,000 \mathrm{~N} / \mathrm{m} ; R=18 \Omega$. What is the minimum DC supply voltage υ for which the relay will make contact when the electrical switch is closed?

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