“How to Calculate the Force Between Two Parallel Current-Carrying Wires”

RIGHT HAND THUMB RULE

While holding the straight conductor in the grip of right hand

Extended thumb –   Direction of  Current

Curling fingers –   Direction of magnetic field

MAGNETIC FIELD DUE TO STRAIGHT CURRENT CARRYING WIRE

FLEMING’S LEFT HAND RULE  

middle finger -Direction of current

thumb – Motion of the conductor

Fore finger – Direction of magnetic field

RIGHT HAND PALM RULE

Tip of the fingers – Direction of magnetic field

Thumb –  Direction of current

Palm forcing –  Direction  of force

FORCE BETWEEN TWO PARALLEL WIRES

FORCE IS ATTRACTIVE

Force between the two wires is ATTRACTIVE when current passed through them is in the same direction.

DEFINITION OF AMPERE

 

Ampere is the current which when flowing  in each of parallel conducting wires having a separation of 1 m in vacuum exerting  a force of 2 X 10^-7 newton per meter of their lengths.