A Rod Is $4.0 \mathrm {~m}$ Long and Has a Square Cross-Section That Is

question 38

Multiple Choice

A rod is $4.0 \mathrm {~m}$ long and has a square cross-section that is $1.5 \mathrm {~cm}$ on each side. An ohmmeter measures $0.040 \Omega$ across its ends. What is the resistivity of the material from which this rod is made?

• A) \(0.015 \Omega \cdot \mathrm { m }\)
• B) \(2.3 \times 10 ^ { - 6 } \Omega \cdot \mathrm { m }\)
• C) \(0.023 \Omega \cdot \mathrm { m }\)
• D) \(1.5 \times 10 ^ { - 4 } \Omega \cdot \mathrm { m }\)

Describe soil structure, composition, and the role of irrigation in soil dynamics.

Explain the methods used to determine essential nutrients for plants.

Understand the processes involved in nutrient uptake, transport, and assimilation in plants.

Understand the specific roles and importance of various macronutrients in plant physiology and growth.

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