1 and 4 are tire.
2 and 3 are not.
If a = 2.0 cm, b = 5.0 cm, and i = 20 a, 6.0 μt is the magnitude of the magnetic field at the point p, So the correct option is (a).
The magnetic influence on moving electric charges, electric currents, and magnetic materials is described by a magnetic field, which is a vector field. A force perpendicular to the charge's own velocity and the magnetic field acts on it when the charge is travelling through a magnetic field.
= μ
i
/ 
= μ
i
/ 
As,
is moving down and
is moving up so,
-
= (μ
i
/
) - [μ
i
/
]
-
= μ
i 24 / 
-
= 
-
= 5.98×
T ≈ 6μT
Therefore, 6.0 μt is the magnitude of the magnetic field .
Learn more about magnetic field here;
brainly.com/question/23096032
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Answer:
coal tar is one of the product of coal
Answer by YourHope:
Hi! ^-^
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