Whenever current flows through the circuit the magnetic compass needle shows deflection due to magnetic effect of current.
Question
You are provided with a magnetic compass, an empty matchbox, a battery of two cells and connecting wires. Using these objects how will you make a tester for testing an electric circuit? Draw the necessary circuit diagram and explain.
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Observing that the bulb does not glow in the circuit shown below in A, Boojho changed the circuit as shown in B. He observed deflection in the magnetic compass. a. What does the deflection in magnetic compass indicate? b. Why did the bulb not glow in A? c. What would be the effect of increase in the number of turns in the coil wound around the magnetic compass in B? d. What will be observed if the number of cells is increased in the circuit shown in B?
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In the circuit given below, Boojho observed that copper is deposited on the electrode connected to the negative terminal of the battery. Paheli tried to repeat the same experiment. But she could find only one copper plate. Therefore she took a carbon rod as negative electrode. Will copper be still deposited on the carbon rod? Explain your answer.
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