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Concepts Of Physics MCQ Edition [Volume 2]
Exam
Concepts Of Physics MCQ Edition [Volume 2]
Subject
Physics
Chapter
Magnetic Field

Concepts Of Physics MCQ Edition [Volume 2] · Physics · Magnetic Field

A 10 -cm long portion of a straight wire carrying a 10 A current is...

A 1010-cm long portion of a straight wire carrying a 10 A10 \text{ A} current is situated in a 0.1 T0.1 \text{ T} magnetic field that is oriented at an angle of 53^{}^{{}^{\circ}} relative to the wire. What magnetic force acts on this portion of the wire?

Options

  1. A0.08 N0.08 \text{ N} perpendicular to both the wire and the field
  2. B0.08 N0.08 \text{ N} parallel to the magnetic field
  3. C0.06 N0.06 \text{ N} perpendicular to both the wire and the field
  4. D0.10 N0.10 \text{ N} perpendicular to both the wire and the field

Correct answer

A. 0.08 N0.08 \text{ N} perpendicular to both the wire and the field

Step-by-step solution

The magnetic force on a current-carrying wire is given by the formula:

F⃗=I(L⃗×B⃗)\vec{F} = I(\vec{L} \times \vec{B})

The magnitude of the force is:

F=ILBsin⁡θF = I L B \sin\theta

Given values are:

I=10 AI = 10 \text{ A}

L=10 cm=0.1 mL = 10 \text{ cm} = 0.1 \text{ m}

B=0.1 TB = 0.1 \text{ T}

\theta = 53^{}^{{}^{\circ}}

Substituting these values into the formula:

F = 10 \times 0.1 \times 0.1 \times \sin(53^{}^{{}^{\circ}})

F=0.1×45=0.08 NF = 0.1 \times \dfrac{4}{5} = 0.08 \text{ N}

From the cross product L⃗×B⃗\vec{L} \times \vec{B}, the direction of the magnetic force is perpendicular to both the wire and the magnetic field.
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