Answer :
Final answer:
Without additional information on defect rates or the number of defective items, it isn't possible to determine how many microwaves out of a shipment of 30 were defective.
Explanation:
The question posed does not provide enough information to determine how many microwaves out of a shipment of 30 were defective. The additional references to electric-field lines, microwave oven energy consumption, and microwave intensity seem to be unrelated to the original question about defective microwaves.
To answer the question about defective microwaves we would typically need a defect rate or a specific number of defective items reported. Without such information, we can't accurately answer the question.
It is best to seek clarification or additional details to proceed with the answer in this case.
