In magnetic units, one weber equals how many lines of magnetic flux in the older cgs system, and which term names a “value of ten to the eighth power magnetic lines of force”?

Introduction / Context:
Magnetic quantities are expressed in SI and in older cgs-based units. Engineers often encounter legacy documentation that mentions “lines of force” or “maxwells.” Converting between systems prevents confusion when comparing specifications or reading vintage texts.

Given Data / Assumptions:

• We are dealing with magnetic flux (not flux density).
• SI unit of magnetic flux is the weber (Wb).
• Older cgs unit is the maxwell (Mx), colloquially “lines of force.”

Concept / Approach:
The exact conversion is 1 weber = 10^8 maxwells. Thus, a “value of ten to the eighth power magnetic lines of force” corresponds to precisely one weber of flux. Remember that flux density is measured in tesla (SI), where 1 tesla = 1 weber per square meter.

Step-by-Step Solution:
Identify the quantity: total magnetic flux, not field intensity.Recall conversion: 1 Wb = 10^8 Mx.Map the phrase “ten to the eighth power lines” to 1 Wb.Choose the term: weber.

Verification / Alternative check:
Handbooks and standards list 1 Wb = 10^8 Mx; dimensional analysis confirms flux density (T) relates as T = Wb/m^2, not as a count of lines.

Why Other Options Are Wrong:
Field and flux are generic words; the specific SI unit asked is weber.

Coulomb is an electric charge unit, not magnetic flux.

Tesla measures flux density, not total flux.

Common Pitfalls:
Confusing flux (Wb) with flux density (T). Always distinguish total flux from flux per area.

Final Answer:
weber (1 Wb = 10^8 maxwells)