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Question
In which among the following circuits does the bulb glow?
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Solution

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Resistances R1, R2, R3 and R4 are connected as shown in the figure. S1 and S2 are two keys. Discuss the current flowing in the circuit in the following cases.

- Both S1 and S2 are closed.
- Both S1 and S2 are open.
- S1 is closed but S2 is open.
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Draw a neat diagram showing a closed electric circuit.
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Assertion: In an open circuit, the current passes from one terminal of the electric cell to another.
Reason: Generally, the metal disc of a cell acts as a positive terminal.
What are the types of electric circuits?

In the above circuit, if the current reading in the ammeter A is 2A, what would be the value of R1?
Set up the circuit shown in Figure again. Move the key to ‘ON’ position and watch carefully in which direction the compass needle gets deflected. Switch ‘OFF’ the current. Now keeping rest of the circuit intact, reverse the connections at the terminal of the cell. Again switch ‘on’ the current. Note the direction in which the needle gets deflected. Think of an explanation.





