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Question

A vertical wire carries a current straight down. To the east of this wire, the magnetic field points:


A

eastwards

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B

downwards

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C

southwards

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D

northwards

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Solution

The correct option is C

southwards


Right-hand thumb rule:

  1. There is a simple way of determining the relationship between the orientation of a conductor's current and also the movements of the magnetic field around a certain conductor. The right-hand rule would be the name given to this approach.
  2. The right-hand rule asserts that perhaps the magnetic field lines supplied by a current-carrying wire would be presented in a similar direction as a person's right hand's folding fingertips, with the thumb towards the orientation of the current flow.

Explanation:

  1. The magnetic field created by such an electric current is always perpendicular to the current direction of flow. Whenever a wire has a current running through it, the magnetic field around it appears. It is used to represent a magnetic field, and arrows on lines of the field are used to demonstrate the magnetic field. There'll be no magnetic field if there is no current.
  2. The circles represent field lines, and the arrows on the lines indicate their orientation. The larger the number of lines in a region, like with electric field lines, the stronger the magnetic field.
  3. Make use of the right-hand rule. Bring our thumb down. Whenever we stare at the eastern edge of the wire, our fingers extend toward the south. The right-hand thumb rule is used to determine the orientation of field lines.

Therefore, option (C) is the correct choice.


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