Contact force that acts to resist sliding between two touching surfaces
1 answer:
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A) 1.05 N
The power dissipated in the circuit can be written as the product between the pulling force and the speed of the wire:
where
P = 4.20 W is the power
F is the magnitude of the pulling force
v = 4.0 m/s is the speed of the wire
Solving the equation for F, we find
B) 3.03 T
The electromotive force induced in the circuit is:
(1)
where
B is the strength of the magnetic field
v = 4.0 m/s is the speed of the wire
L = 10.0 cm = 0.10 m is the length of the wire
We also know that the power dissipated is
(2)
where
is the resistance of the wire
Subsituting (1) into (2), we get
And solving it for B, we find the strength of the magnetic field: