Question

A current carrying straight conductor express force perpendicular to its length and the magnetic field design an activity for the verification of the above mentioned statement and describe it with a labelled diagram

Answer 1

Answer

The direction of force in a current carrying conductor can be understood clearly From Fleming's left hand rule.Fleming's left hand rule states that When an electric current passes through a straight wire, an external magnetic field is applied across that flow, the wire experiences a force perpendicular both to the field and to the direction of the current flow. This rule can be used to determine the direction of the force, magnetic field and current. A left hand can be held, so that the thumb, first finger and second finger are held mutually perpendicular to each other. The thumb represents the direction of Motion resulting from the force on the conductor. The first finger represents the direction of the magnetic Field. The second finger represents the direction of the Current. Please refer the figure given below.

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Answer 2

Given:

A current carrying conductor is placed in a magnetic field.

To find:

• Expression for force experienced by the conductor.

• Activity or experiment to support the statement with the labelled diagram.

Solution:

General force experienced by a current carrying conductor placed in a magnetic field such that the length vector is at an angle of $\theta$ with magnetic field intensity is:

$\boxed{ \bold{ \large{ \vec{F} = i( \vec{l}\times \vec{B})}}}$

$\boxed{ \bold{ \large{ | \vec{F} | = i \{l\times B \times \sin( \theta) \}}}}$

Now , if the angle is 90°:

$\sf{ = > | \vec{F} | = i \{l\times B \times \sin( {90}^{ \circ} ) \}}$

$\sf{ = > | \vec{F} | = i \{l\times B \times 1 \}}$

$\boxed{ \sf{ = > | \vec{F} | = i \times l \times B}}$

Required activity:

• Place current carrying coil in between horseshoe shaped magnet.

• You will be able to observe that the coil is experiencing force in a perpendicular direction and is trying to rotate.

• This same phenomenon is observed in an electric motor.

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