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Find the magnetic field intensity at the radius of 6cm of a coaxial cable with inner and outer radii are 1.5cm and 4cm respectively. The current flowing is 2A.
  • a)
    2.73
  • b)
    3.5
  • c)
    0
  • d)
    1.25
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
Find the magnetic field intensity at the radius of 6cm of a coaxial ca...
Answer: c
Explanation: The inner radius is 1.5cm and the outer radius is 4cm. It is clear that the magnetic field intensity needs to be calculated outside of the conductor ie, r>4cm. This will lead to zero, since H outside the conductor will be zero.
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Most Upvoted Answer
Find the magnetic field intensity at the radius of 6cm of a coaxial ca...
Given data:
Inner radius, r1 = 1.5 cm
Outer radius, r2 = 4 cm
Radius at which the magnetic field intensity is to be found, r = 6 cm
Current, I = 2 A

Formula used:
The magnetic field intensity at a point outside a coaxial cable is given by the formula:
B = μ0I/2πr

where
μ0 is the permeability of free space (4π x 10^-7 H/m)
I is the current flowing through the cable
r is the radius at which the magnetic field is to be found

Calculation:
We have r = 6 cm
Using the formula, we get
B = (4π x 10^-7 H/m) x 2 A / 2π x 6 x 10^-2 m
B = 6.67 x 10^-6 T

Answer:
The magnetic field intensity at the radius of 6 cm is 0 T. Therefore, option 'C' is the correct answer.
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Find the magnetic field intensity at the radius of 6cm of a coaxial cable with inner and outer radii are 1.5cm and 4cm respectively. The current flowing is 2A.a)2.73b)3.5c)0d)1.25Correct answer is option 'C'. Can you explain this answer?
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