Question
The bulb in the circuit shown in Figure does not glow. Can you identify the problem? Make necessary changes in the circuit to make the bulb glow.



To make the bulb glow, the negative terminal of one cell should be connected to the positive terminal of the other cell, as shown in the given figure.

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| S.No. | Column I | Column II | |
| $1.$ | A magnetic device used for finding geographic directions. | $(a)$ | Magnetic needle. |
| $2.$ | A device which is essential in an electric bell. | $(b)$ | Electromagnet |
| $3.$ | A fuse used in expensive and sensitive electric devices. | $(c)$ | Cartridge fuse. |
| $4.$ | An alloy used as a material of fuse wir. | $(d)$ | Fusible alloy. |
| $5.$ | A material used for making filament of a bulb. | $(e)$ | Tungsten |
| $6.$ | A material which does not allow the electric current to pass. | $(f)$ | Wax |
| $7.$ | A material used for making electromagnets. | $(g)$ | Soft iron. |