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Solved exercise · level 2 of 5

Flux density at the centre of a coil

Skills: Calculate

Statement

A coil 80 cm long has 300 turns and carries 15 A. What flux density does it create at its centre, in air? (µ₀ = 4π·10⁻⁷)

N = 300 · I = 15 A · l = 80 cm

Parametric exercise: the values change with every draw; these are one example.

Guided problem in 4 steps: unknown, formula, units, data, result.

1 hint from Bastaya available in the lab
Solution

l = 80 cm = 80 × 10⁻² m; B = 4π·10⁻⁷ × 300 × 15 / l = 0.00707 T = 7.07 mT.

Course sheet of the chapter : Magnetism & electromagnetism

This chapter is covered by the paths: General electricity, ISL-oriented exercises

Other exercises of the chapter

Simulated time00:00:00
Q = I·t-
W = P·t-

Circuit diagram CEI 60617

How does it work?

Each big hole is a circuit node: you push one leg of a component into it. The 4 small holes around it are connected to it: chips and leads plug in there.

  1. Place a component Drag it from the palette: it snaps onto the grid. R rotates it.
  2. Bridge neighbouring holes Pick the jumper chip (or C) and drag on the board: bridged holes become a single node.
  3. Draw a lead For long links and the power supply: from one big hole to another, or to a terminal.
  4. Close the loop The circuit is solved live (Ohm, Kirchhoff) and the diagram follows.

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