Question

A metallic rod held horizontally along east west direction, is allowed to fall under gravity . Will there be an emf induced at its ends

Answer 1

There will be an emf induced

as e=[BLV] Earth's magnetic field is from South to North which is perpendicular to velocity direction

and B,L,V are mutually perpendicular

Hence there will be an emf of 'BLV'

Answer 2

Explanation:

ʟᴇɴᴢ’s ʟᴀᴡ: ᴀᴄᴄᴏʀᴅɪɴɢ ᴛᴏ ᴛʜɪs ʟᴀᴡ “ᴛʜᴇ ᴅɪʀᴇᴄᴛɪᴏɴ ᴏғ ɪɴᴅᴜᴄᴇᴅ ᴄᴜʀʀᴇɴᴛ ɪɴ ᴀ ᴄʟᴏsᴇᴅ ᴄɪʀᴄᴜɪᴛ ɪs ᴀʟᴡᴀʏs sᴜᴄʜ ᴀs ᴛᴏ ᴏᴘᴘᴏsᴇ ᴛʜᴇ ᴄᴀᴜsᴇ ᴛʜᴀᴛ ᴘʀᴏᴅᴜᴄᴇs ɪᴛ.”

ᴛʜᴇ ᴅɪʀᴇᴄᴛɪᴏɴ ᴏғ ɪɴᴅᴜᴄᴇᴅ ᴄᴜʀʀᴇɴᴛ ɪɴ ᴀ ᴄɪʀᴄᴜɪᴛ ɪs sᴜᴄʜ ᴛʜᴀᴛ ɪᴛ ᴏᴘᴘᴏsᴇs ᴛʜᴇ ᴠᴇʀʏ ᴄᴀᴜsᴇ ᴡʜɪᴄʜ ɢᴇɴᴇʀᴀᴛᴇs ɪᴛ. ʏᴇs, ᴀɴ ᴇᴍғ ᴡɪʟʟ ʙᴇ ɪɴᴅᴜᴄᴇᴅ ᴀᴛ ɪᴛs ᴇɴᴅs. ᴊᴜsᴛɪғɪᴄᴀᴛɪᴏɴ: ᴀs ᴛʜᴇ ᴍᴇᴛᴀʟʟɪᴄ ʀᴏᴅ ғᴀʟʟs ᴅᴏᴡɴ, ᴛʜᴇ ᴍᴀɢɴᴇᴛɪᴄ ғʟᴜx ᴅᴜᴇ ᴛᴏ ᴠᴇʀᴛɪᴄᴀʟ ᴄᴏᴍᴘᴏɴᴇɴᴛ ᴏғ ᴇᴀʀᴛʜ’s ᴍᴀɢɴᴇᴛɪᴄ ғɪᴇʟᴅ ᴋᴇᴇᴘs ᴏɴ ᴄʜᴀɴɢɪɴɢ.

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@Gurjari