Rohit made a circuit as shown in the figure. He observed that the bulb does not glow, but onbringing a compass needle near, it showed deflection. He was quite confused that if currentis flowing through the circuit then why the bulb is not glowing. Meanwhile his friendSaurav arrived and suggested that he should add one more cell in the circuit. When headded one more cell, the bulb started glowing.(a) What does the deflection of a compass needle show?(b) Explain why did the bulb not glow in the first case but it started glowing in the secondcase.(c) Suggest two liquids which Rohit might have used as electrolyte in the above experime
Question
Rohit made a circuit as shown in the figure. He observed that the bulb does not glow, but onbringing a compass needle near, it showed deflection. He was quite confused that if currentis flowing through the circuit then why the bulb is not glowing. Meanwhile his friendSaurav arrived and suggested that he should add one more cell in the circuit. When headded one more cell, the bulb started glowing.(a) What does the deflection of a compass needle show?(b) Explain why did the bulb not glow in the first case but it started glowing in the secondcase.(c) Suggest two liquids which Rohit might have used as electrolyte in the above experime
Solution
(a) The deflection of a compass needle shows that there is a magnetic field present. This magnetic field is created by the flow of electric current through the wire in the circuit.
(b) The bulb did not glow in the first case because the voltage provided by the single cell was not enough to overcome the resistance of the bulb and make it glow. When Rohit added one more cell to the circuit, the combined voltage of the two cells was enough to make the bulb glow. This is because the voltage or electric potential difference across the bulb increased, allowing more current to flow through the bulb and thus, making it glow.
(c) Rohit might have used liquids like lemon juice or vinegar as the electrolyte in the experiment. These liquids are commonly used in simple homemade batteries because they contain ions that can move and carry electric charge, which is necessary for the flow of electric current in the circuit.
Similar Questions
A simple circuit consists of a battery, wire, bulb, and switch. When the switch is on, a small magnetic compass is placed near the circuit and shows a slight deflection to the west. What causes the deflection? The compass is responding to the current because it was made of copper. The current moving through the circuits causes a local magnetic field. The electricity from the wire was arcing to the compass needle. The charges in the compass's needle is flowing with current in the wire.
In which circuit did you observe a brighter light bulb?*1 pointCircuit with two dry cellsCircuit with one dry cellThe brightness of the bulbs in the two circuits are the same.The bulb did not light up in any of the circuits.
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A student performed experiments taking similar bulbs and cells, but two different solutions I and II as shown in the figure.She found that the bulb in the setup P glows more brightly as compared to that of the setup Q. You would conclude that:Options:Higher current is flowing through the circuit in setup P as compared to setup Q.Higher current is flowing through the circuit in setup Q as compared to setup P.Equal current is flowing through both the circuits.The current flowing through the circuits in the two setups cannot be compared in this manner.
In your own words, explain why the moving compass needle proved there was a magnetic field around the electric current.
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