Magnetic Forces and Torques on Current Loops
Rectangular loop:
• currents in left and right wires are
equal and opposite
• magnetic forces on left and right
wires are equal and opposite
• no force on top and bottom
segments because …??
• net magnetic force on loop is
zero
General loop:
• can be decomposed into
rectangular pieces
Net force on any closed current
loop (in uniform B) is zero
L
I
B
W
Magnetic Forceand Torqueon Current
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