Define magnetic flux density B in words.

Magnetic flux density is the force per unit length per unit current on a conductor placed at right angles to the magnetic field.

Define one tesla in terms of force, current and length.

One tesla is the magnetic flux density when a wire carrying a current of one ampere, perpendicular to the field, experiences a force of one newton per metre of its length.

Calculate the magnetic flux when magnetic flux density = 0.91 T, area = 0.013 m², angle to normal = 0.6 rad.

Magnetic flux = 0.91 × 0.013 × cos(0.6) = 0.00976 Wb.

What are the key features of a search coil used to investigate magnetic flux?

It is a small coil of known area and known number of turns.

OCR A-Level Physics A H556

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Electromagnetism

Magnetic flux density and the tesla

2 things to know
Papers 1, 2 and 3

Overview

Recall questions on defining magnetic flux density and the tesla, magnetic flux and its calculation, and measuring flux density with a search coil.

What you need to know

Answer each one before you reveal it.

Your recallNot started

Numbers

What is the SI unit of magnetic flux density, and what are the force on a charged particle moving perpendicular to a magnetic field and the radius of its circular path?

Numbers

Define magnetic flux and state its formula.

Questions from this subtopic

Each one with the model answer underneath.

1
Define magnetic flux density B in words.
Model answer
Magnetic flux density is the force per unit length per unit current on a conductor placed at right angles to the magnetic field.
2
What is the SI unit of magnetic flux density?
Model answer
The tesla (T).
3
Define one tesla in terms of force, current and length.
Model answer
One tesla is the magnetic flux density when a wire carrying a current of one ampere, perpendicular to the field, experiences a force of one newton per metre of its length.
4
Define magnetic flux and state its formula.
Model answer
Magnetic flux Φ is the product of magnetic flux density and the area perpendicular to the field: Φ = BA cos θ, where θ is the angle between the field direction and the normal to the area.
5
Calculate the magnetic flux when magnetic flux density = 0.91 T, area = 0.013 m², angle to normal = 0.6 rad.
Model answer
Magnetic flux = 0.91 × 0.013 × cos(0.6) = 0.00976 Wb.
6
What are the key features of a search coil used to investigate magnetic flux?
Model answer
It is a small coil of known area and known number of turns.

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Magnetic flux density and the tesla

Overview

What you need to know

What is the SI unit of magnetic flux density, and what are the force on a charged particle moving perpendicular to a magnetic field and the radius of its circular path?

Define magnetic flux and state its formula.

Questions from this subtopic

Define magnetic flux density B in words.

What is the SI unit of magnetic flux density?

Define one tesla in terms of force, current and length.

Define magnetic flux and state its formula.

Calculate the magnetic flux when magnetic flux density = 0.91 T, area = 0.013 m², angle to normal = 0.6 rad.

What are the key features of a search coil used to investigate magnetic flux?

Other ways to work this

What is inside Levo

The 3-step method, run for you

Cram a whole paper in one sitting

Blank Blitz makes facts automatic

Build It gets the exam shape right

Test It catches misconceptions

Brain Breaks between sessions

Every question in Electromagnetism, on a schedule.