Students made electromagnets with identical iron nails and counted the pins each could lift. | Set-up | Turns of wire | Number of cells | Pins lifted | |---|---|---|---| | A | 20 | 1 | 5 | | B | 40 | 1 | 11 | | C | 40 | 2 | 20 | (a) Which two set-ups show the effect of the number of turns? What do they show? (b) Which two set-ups show the effect of current? What do they show? (c) Why was it important to use identical nails?

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TextFactors Affecting Strength of Electromagnet

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Two identical iron nails P and Q are wound with insulated copper wire as shown, and each is joined to one identical cell. Which statement is correct?

MCQ (Single)Electromagnet and Its ApplicationsFactors Affecting Strength of Electromagnet

Rohan's electromagnet (an iron nail wound with 20 turns of wire and joined to one cell) can lift only two pins. Suggest two ways to make it stronger. What will happen if he removes the iron nail and keeps only the coil?

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Factors Affecting Strength of Electromagnet