Grade 11 · Science · Physics

11th grade Magnetic field around a wire and inside a coil worksheet

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Magnetic field around a wire and inside a coil

Grade 11 Science Worksheet - Building Confidence

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Circle the best answer, or write your answer on the line.

A long straight wire carries 6 A. What is the field 3 cm from it, to 0.01 μT, Ari? Use μ₀ = 4π × 10⁻⁷ T·m/A.
A long straight wire carries 1.5 A. What is the field 0.5 cm from it, to 0.01 μT, Bo? Use μ₀ = 4π × 10⁻⁷ T·m/A.
A long straight wire carries 10 A. What is the field 8 cm from it, to 0.01 μT, Kira? Use μ₀ = 4π × 10⁻⁷ T·m/A.
4.
“Field-line diagram (example data):” In the diagram, which way does the field point at Q, to the left of the wire, Luz?
- Into the page
- Straight toward the wire
- Out of the page
5.
In the end-on diagram, which way do the field circles run, Milo?
- Counterclockwise, seen from the front
- Out from the wire like spokes
- Clockwise, seen from the front
6.
What shape are the field lines around a long straight wire, by Noah's reading (OpenStax)?
- Straight lines parallel to the wire
- Circles around the wire
- Straight lines pointing away from the wire
7.
In the end-on diagram, why are the circles farther apart away from the wire, Pia?
- The field lines point toward the wire
- The field weakens as 1 ÷ r
- The current slows down farther out
8.
A compass sits beside a long wire with current. Which way does its needle line up, Ren?
- Pointing straight away from the wire
- Along a circle around the wire
- Pointing straight at the wire
9.
In the solenoid diagram, what is the field like inside, near the middle, Tala?
- Strongest near the wire of each turn, weak at the center
- Nearly uniform: straight and evenly spaced
- Zero, since the turns cancel
10.
In the solenoid diagram, what is the field like outside the solenoid, Zee?
Use the picture in question 9.
- The same as inside
- Stronger than inside
- Nearly zero

11th grade Magnetic field around a wire and inside a coil worksheet – printable — Print: 1 2 3 4 5 6

About this worksheet

Magnetic field around a wire and inside a coil. Every version has 10 questions, and the answer key prints on the second page.

What your child will learn

I can find the field of a long straight wire with B = μ₀I ÷ (2πr), and its direction with the right-hand rule.
I can scale the wire's field (it grows with I and falls as 1 ÷ r) and add the fields of two wires midway between them.
I can use B = μ₀nI inside a long solenoid, with n = N ÷ L, and explain why its length does not matter at fixed n.

Standard: supports HS-PS2-5

Words to know

μ₀: The magnetic constant, 4π × 10⁻⁷ T·m/A

tesla (T): The unit of magnetic field; 1 μT = 10⁻⁶ T

solenoid: A long coil of wire

turns per meter (n): Total turns divided by the coil's length, N ÷ L

right-hand rule: Thumb along the current; fingers curl with the field

Common mistakes

Your child used the distance squared. The field of a long straight wire falls as 1 ÷ r, so B = μ₀I ÷ (2πr), with r in meters.

Your child used the total number of turns. B = μ₀nI uses n, the turns per meter, which is N ÷ L.

Your child subtracted fields that add. Between wires with opposite currents, both fields point the same way, so they add.

Questions parents ask

What is the most common mistake with magnetic field around a wire and inside a coil?

Your child used the distance squared. The field of a long straight wire falls as 1 ÷ r, so B = μ₀I ÷ (2πr), with r in meters.

Are these 11th grade science worksheets free to print?

Yes. All 6 printable versions at each level are free to print, with the answer key, and no account is needed.

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