Q1. A mechanic visits you one day, carrying a large wrench. He says the wrench became magnetized after setting it near a large magnet. Now the wrench has become an annoyance, attracting all the other tools in her toolbox toward it. Can you think of a way to demagnetize the wrench for him?
Q2. Describe briefly how an iron rod can be magnetized using an electrical method.
Q3. How can the strength of the magnetized iron rod in Q2 be increased?
Q4. What happens to the magnetized iron rod when current stops flowing?
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Answer: one of the method is to heat the wrench to or above its curie point,another is by hammering or by applying an alternate current.
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