Câu hỏi:
29/04/2020 306Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 31 to 35.
Magnets
A solid object that has the power to attract iron and some metals is called a magnet. It does this through its magnetic field, a region of force surrounding it. The (31) _______ the magnet, the more intense is the field.
Objects that are attracted to the magnet feel a force (32) _______ as magnetism when they are inside the magnetic field. This magnetic force can pass through some materials. Even a weak magnet will attract a pin to the other side of a sheet of paper, for example.
Magnets come in (33) _______ shapes. A familiar one is the curved horseshoes magnet. There are also bar magnets in the form of disc or a stubby cylinder. Every magnet has (34) _______ poles, called north and south, at opposite ends of it: at the two ends of a horseshoes magnet, for example, or on the two sides of a disc.
Powerful magnets can be made by passing an electric current through wire coiled around a piece of iron. The (35) _______ is called and electromagnet. Magnets are used in many household and everyday devices. They are also commonly used in industrial machinery, usually in the form of electromagnets.
Điền câu 32
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Trả lời:
Giải bởi Vietjack
Đáp án C
Known as: được biết đến là
Dịch: “Những vật thể mà bị hút bởi nam châm sẽ nhận được một lực được biến đến là từ trường khi chúng ở trong vùng từ trường ấy
Nhà sách VIETJACK:
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