4. An electric bulb in an electric circuit glows
(a) when you connect positive terminal of electric bulb to negative terminal of electric cell
(b) when you connect negative terminal of electric bulb to positive terminal of electric cell
(c) when you connect positive terminal of electric bulb to positive terminal of electric cell
(d) all of these
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Explanation:
when you connect positive terminal of electric bulb to negative terminal of electric cell is the answer
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