A 4.0 cm long straight wire carrying a current of 8 A is placed perpendicular to a uniform magnetic field of strength 0.15 T. The magnetic force on the wire is mN.
Text Solution
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(48)
To calculate the magnetic force on a wire, we use the formula:
Where:
I is the current in the wire (in amperes),
is the length of the wire (in meters),
B is the magnetic field strength (in teslas).
Given that:
The current I is 8 A,
The length of the wire 
is 4.0 cm, which is 0.04 m (since 
),
The magnetic field strength B is 0.15 T,
Substituting these values into the formula gives:
Calculating this:
To convert this to millinewtons (mN), recall that 
. Therefore:
Thus, the magnetic force on the wire is 48 mN.
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