The figure below represents a wire carrying a current in the counter-clockwise d
ID: 1483594 • Letter: T
Question
The figure below represents a wire carrying a current in the counter-clockwise direction. Indicate the directions (into the page or out of the page) of the associated magnetic field inside the circle, and outside of the circle. Inside the Circle: Outside the Circle: The figure below represents a wire carrying a current to the right. Indicate the directions (into the page or out of the page) of the associated magnetic field above and below the wire. Above the wire: Below the wire: The figure below is a magnetic field with a positive charge moving through it as shown. Indicate the direction of the magnetic force on the charge.Explanation / Answer
4. Right hand thumb rule for loop: If you curl your fingers in the direction current then the direction of your thumb will be the direction of magnetic field inside the loop and opposite for outside the loop. Therefore
Inside the circle:------ Into the page
Outside the circle:------ Out of the page
5. Right hand thumb rule for wire: If you point your thumb in the direction of current then the direction in which your fingers would curl would give the direction of electric field line. Moreover the direction of electric field is tangent to the curve representing electric field line. Hence
Above the wire:------ Into the page
Below the wire:------ Out of the page
6. A simple rule here: If you put your palm facing the direction of magnetic field (here downward) such that your fingers point towards the direction of particles velocity then the direction in which your thumb points at will be the direction of force. (Remark: this is when the charge on the particle is positive , for a negative charge just reverse the direction of force that you had acheived) Hence In this case the direction of the force will be downward.
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