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AP TET Paper 2 Math and Science Model Paper 1

Question : 142 of 150

Marks: +1, -0

Study the given information.

Consider the force on a current carrying straight conductor in a magnetic field.

(i) It is perpendicular to the direction of current.

(ii) It is perpendicular to the magnetic field.

(iii) Its direction can be found using right-hand thumb rule.

Select the correct option.

All (i), (ii) and (iii) are correct
Both (i) and (ii) are correct
Only (i) is correct
Only (ii) is correct

Validate

Solution:

Concept:

A current-carrying conductor in a magnetic field experiences a force that is perpendicular to both the current direction and the magnetic field direction.

Explanation:

The force on a straight current-carrying conductor placed in a magnetic field is given by

\vec{F} = I \vec{L} \times \vec{B}

So the force is perpendicular to the direction of current

\vec{L}

and also perpendicular to the magnetic field

\vec{B}

Thus, statements (i) and (ii) are correct.

However, the direction of this force is found using Fleming's left-hand rule, not the right-hand thumb rule.

Therefore, statement (iii) is incorrect.

It is perpendicular to the direction of the current.	True
It is perpendicular to the magnetic field.	True
Its direction can be found using the right-hand thumb rule.	False

Additional Information

Fleming’s left-hand rule:

According to Fleming's left-hand rule, if the thumb, forefinger, and middle finger of the left hand are stretched to be perpendicular to each other as shown in the illustration at left, and if the forefinger represents the direction of the magnetic field, the middle finger represents the direction of the current, then the thumb represents the direction of the force.

Answer:

Both (i) and (ii) are correct.

Correct option: B.

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