The voice coil of a speaker has a diameter of , contains turns of wire, and is placed in a magnetic field. The current in the voice coil is . Determine the magnetic force that acts on the coil and the cone.
Step 1: Given data
Current,
No of turns,
diameter,
magnetic field,
Step 2: Calculating the length of the loop
Length of the loop can be calculated as
Step 3: Calculating magnetic force
Magnetic force, where is the angle made by the length vector with magnetic field vector.
Here
Hence,
Therefore, the value of magnetic force is