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Physics

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The number of turns in a solenoid is doubled, and at the same time its length is doubled. Part A:Does the magnetic field within the solenoid increase, decrease, or stay the same?Part B:Choose the best explanation from among the following: A:Making a solenoid longer decreases its magnetic field, and therefore the field decreases. B:Doubling the number of turns in a solenoid doubles its magnetic field, and hence the field increases. C:The magnetic field remains the same because the number of turns per length is unchanged.

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