Can the big iron nail attract the small nails? why?

铁针还能吸引细铁钉 吗 ?为什么?

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Which iron nail will become rusty faster? Why?

哪枚铁钉会生锈生得较快? 为什么?

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Put a big iron nail into the coil.

把一板大铁针放进线圈里.

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The magnetic force will be stronger if we put an iron nail into the coil.

如果我们把铁钉放进线圈里,磁力就会增强.

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