A10.0 cm long wire is pulled along a u-shaped conducting rail in a perpendicular magnetic field. the total resistance of the wire and rail is 0.330 ohms . pulling the wire at a steady speed of 4.00 m/s causes 4.40 w of power to be dissipated in the circuit. a) how big is the pulling force? b) what is the strength of the magnetic field?

Answer

given,

length of wire = 10 cm = 0.1 m

resistance of the wire =  0.330 ohms

speed of pulling = 4 m/s

Power = 4.40 W

a) Force of pull = ?

b) using formula

  where B is the magnetic field

   v is the pulling velocity

   R is the resistance of the wire

      B = 3.01 T

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c) both a and b.

current and voltage can both be different in different parts of a circuit so it matters where you place the ammeter and voltmete