What is the symbol of magnetic field, its SI unit, and its direction?

Question

BlackTom AI · Accepted Answer

Re-stating the question and answer options helps set the stage for analysis: What is the symbol of the magnetic field, its SI unit, and its direction?

Option a: The symbol is T, the unit is B, the direction is out from the north pole and into the south pole.
- This is incorrect because the symbol for the magnetic field is not T; T stands for tesla, which is the unit. The symbol B should represent the magnetic field itself, not the unit. The direction part aligns with the general idea of field lines, but the swapped symbol and unit render this option wrong.

Option b: The symbol is B, the unit is T, the direction is out from the south pole and into the north pole.
- Here the symbol B is correct, and the unit T (tesla) is correct. However, the stated direction is opposite to the conventional magnetic field direction in the space outside a magnet (field lines go from the north to the south pole). Since the direction is reversed, this option is inaccurate.

Option c: The symbol is B, the unit is T, the direction is out from the north pole and into the south pole.
- This option uses the correct symbol for the magnetic field (B) and the correct SI unit (tesla, T). The direction described—outward from the north pole and into the south pole—is consistent with how magnetic field lines are defined outside a magnet, where they emerge from the north and complete their loop into the south. Conceptually, this matches standard physics conventions for magnetic field direction in the region outside magnetic sources.

Option d: The symbol is F, the unit is N, the direction is out from the south pole and into the north pole.
- This is incorrect because F (force) and N (newtons) pertain to mechanical force, not the magnetic field. Mixing these units with magnetic field terminology confuses different physical quantities, and the direction stated also contradicts the standard field direction pattern.

To recap the common conventions: the magnetic field symbol is B, its SI unit is tesla (T), and the field lines outside a magnet point from the north pole toward the south pole. This makes option c the consistent choice when all three aspects—symbol, unit, and direction—are evaluated together.

What is the symbol of magnetic field, its SI unit, and its direction?单项选择题

类似问题

Two long parallel wires carry currents of 20 A and 5.0 A in opposite directions. The wires are separated by 0.20 m. At what point are the contributions to the magnetic field from the two wires the same?

Which of the following magnetic fields is correct for a single bar magnet?

An electric current flows into the page. What is the direction of the magnetic field?

A DC current produces a/an:

A 2.00 A current runs through a solenoid with 300 turns over 0.500 m. Calculate the magnetic field inside the solenoid. Also, calculate the magnetic field at a distance of 0.0400 m from a straight wire carrying the same current.

A long straight wire carries a current of 7.0 A. What is the magnetic field strength 0.05 m away from the wire?

Which of the following diagrams represents the magnetic field due to a circular current?

What is the magnitude of the field? B = Answer Question 6[input] μT

更多留学生实用工具

智能学习助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单