1. The following factors influence the magnetic induction on the conductor wire.
(1) the current flowing in the wire
(2) permittivity
(3) wire density
(4) the distance of a point from the wire
Which statements are correct
Solution :
The equation of magnetic induction of a wire :
μo = Permeability of a vacuum or magnetic constant
I = Electric current flowing on the wire
r = the distance of a point from the wire
B = the magnitude of magnetic induction
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2. Note the statements related to the following magnetic induction.
(1) the current flowing in the wire
(2) the permeability of a vacuum
(3) wire cross-sectional area
(4) wire density
What affects magnetic induction magnitudes on a wire conductor.
Solution
Learn the magnetic induction formula and previous description.
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3. The electric current I flows on the conductor wire. What is the magnetic induction at the center of the circle (P)? (µo = 4π.10-7 Wb.m-1.A-1)
Known :
Radius of circle (r) = 6 cm = 6 x 10-2 meters
Electric current (I) = 8 Ampere
Permeability of a vacuum (µo) = 4π x 10-7 Wb.A-1 m-1
Wanted: the magnetic induction at the center of the circle (P)
Solution :
360o – 90o = 270o. 270o / 360o = 3/4 then 270o = 3/4 circumference
The magnetic field formula at the center of the coil with a number of loops:
B = magnetic field, N = number of windings, I = electric current, r = radius of curvature
In the above problem, there is only one winding so that N is removed from the equation. The wire coil on the above problem is not 1 circle but 3/4 circle. The above formula is adjusted again with this problem :
The magnetic induction at the center of the circle :
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4. Current 2 A flows on a circular wire like the picture. What is the magnitude and direction of magnetic induction at point P if the radius of circle 4π cm.
Known :
Radius (r) = 4π cm = 4π x 10-2 meters
Electric current (I) = 2 Ampere
Permeability of a vacuum (µo) = 4π x 10-7 Wb.A-1 m-1
Wanted : The magnitude and direction of magnetic induction at point P
Solution :
The wire coil on the above problem is 1/2 circle.
The magnitude of magnetic induction at point P :
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