In the set up in Fig. 5, the suspended metre rule in equilibrium balanced by the magnet and the weight shown. The iron core is fixed to the bench.

      

In the set up in Fig. 5, the suspended metre rule in equilibrium balanced by the magnet and the weight shown. The iron core is fixed to the bench.
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i) State and explain the effect on the metre rule when the switch S, is closed.
ii) What would be the effect of reversing the battery terminals?
iii) Suggest how the set up in figure 5 can be adapted to measure the current flowing in the current circuit.

  

Answers


John
i) The magnet will be attracted towards the soft iron core. The end of coil facing the magnet becomes south pole when the switch is closed.

ii) The current is reversed and magnet is now repelled away from the iron core

iii) Attaching a pointer to the metre rule such that it reads zero when switch S is open. The rheostat used to vary the current maximum and calibration are done accordingly
johnmulu answered the question on April 19, 2017 at 07:26


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