How do we test the presence of weak current in a circuit:
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ʜᴇɴᴄᴇ, ᴀ ʟᴇᴅ ʙᴜʟʙ ᴏʀ ᴀ ᴍᴀɢɴᴇᴛɪᴄ ᴄᴏᴍᴘᴀꜱꜱ ɪɴᴅɪᴄᴀᴛᴇꜱ ᴛʜᴇ ᴘʀᴇꜱᴇɴᴄᴇ ᴏꜰ ᴀ ᴡᴇᴀᴋ ᴄᴜʀʀᴇɴᴛ ɪɴ ᴛʜᴇ ᴄɪʀᴄᴜɪᴛ.
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Explanation:
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HENCE A LEAD BULB OR A MAGNETIC COMPASS INDICATE THE PRESENCE OF A WEAK CURRENT IN THE CIRCUIT
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