Question

Use the expression f=q(v x b), to define the si unit of magnetic field​

Answer 1

Answer:

The expression for magnetic field is,

F = q(vxB)

If v and B both are normal to each other, then F = qvB.

Now if q = 1, v = 1, then F = B

Hence, the magnetic field at a point is equal to the force which a unit charge experiences when it enters with unit velocity in a direction normal to the direction of the magnetic field at that point.

Answer 2

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ᴛʜᴇ ᴇxᴘʀᴇssɪᴏɴ ғᴏʀ ᴍᴀɢɴᴇᴛɪᴄ ғɪᴇʟᴅ ɪs,

ғ = ϙ(ᴠxʙ)

ɪғ ᴠ ᴀɴᴅ ʙ ʙᴏᴛʜ ᴀʀᴇ ɴᴏʀᴍᴀʟ ᴛᴏ ᴇᴀᴄʜ ᴏᴛʜᴇʀ, ᴛʜᴇɴ ғ = ϙᴠʙ.

ɴᴏᴡ ɪғ ϙ = 1, ᴠ = 1, ᴛʜᴇɴ ғ = ʙ

ʜᴇɴᴄᴇ, ᴛʜᴇ ᴍᴀɢɴᴇᴛɪᴄ ғɪᴇʟᴅ ᴀᴛ ᴀ ᴘᴏɪɴᴛ ɪs ᴇϙᴜᴀʟ ᴛᴏ ᴛʜᴇ ғᴏʀᴄᴇ ᴡʜɪᴄʜ ᴀ ᴜɴɪᴛ ᴄʜᴀʀɢᴇ ᴇxᴘᴇʀɪᴇɴᴄᴇs ᴡʜᴇɴ ɪᴛ ᴇɴᴛᴇʀs ᴡɪᴛʜ ᴜɴɪᴛ ᴠᴇʟᴏᴄɪᴛʏ ɪɴ ᴀ ᴅɪʀᴇᴄᴛɪᴏɴ ɴᴏʀᴍᴀʟ ᴛᴏ ᴛʜᴇ ᴅɪʀᴇᴄᴛɪᴏɴ ᴏғ ᴛʜᴇ ᴍᴀɢɴᴇᴛɪᴄ ғɪᴇʟᴅ ᴀᴛ ᴛʜᴀᴛ ᴘᴏɪɴᴛ.

Explanation:

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