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# A Lab Report to Investigate the Factors Affecting the Strength Paper

Background Theory: Some metals such as nickel and iron can be magnetized using an electromagnet. The strength of the electromagnet depends on various factors which include the current, no. Of turns per unit length and the core of the magnetized metal. In this experiment, will study the effect of spacing between the turns of the copper coil wound around the iron nail.

Variables: Controlled Variables Dependent Variables I Independent Variables I Length of Copper Wrenching in the copper hardcore of the electromagnets of Cross section of the iron correct point at which magnetic field strength is measurements I Strength of the Electromagnet Spacing of the turns of copper wire I How the variables are controlled: I. The length Of the copper Wire is kept constant at IS CM for all experiments 2. The current in the copper wire is kept constant by keeping the voltage in the circuit constant as the copper Wire has a constant resistance. . The area Of cross section of the nail is kept constant at a particular value throughout the experiment as a single iron nail is used. 4. The point at Which the magnetic field strength is measured is kept at 5 CM below the lower tip of the iron nail. 5. The time for carrying out the experiment is kept constant at 15 miss. Hypothesis: As the distance between the consecutive coil increases, the no. Of coils per unit length decreases and therefore, the magnet field strength also decreases.

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Procedure: * Wind the coil around an electromagnet, Measure the distance between two consecutive turns of copper wire using tree scale. * Plug in the switch for IS minutes, Switch off the current after that. Measure the strength of the magnetic field produced by the iron nail using the Fernier magnetic field strength sensor at a point S CM below the tip of the iron nail. ‘k Repeat the experiment by changing the distance between two consecutive turns of copper wire.

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