When a straight wire carrying a current I is put into a magnetic field B, the cu

Question

When a straight wire carrying a current I is put into a magnetic field B, the current will experience a force: F = ILB sin theta. Where L is the length of the wire which is in the magnetic field, theta is angle between the directions of current flowing and the magnetic field. According to the right-hand-rule for vector product, the force is perpendicular to both the current and the magnetic field. Use the right-hand-rule, determine the direction of the magnetic force on a current carrying strip in the following diagram, where the magnetic field is parallel to the surface of this paper: The magnetic force on the current strip is directed: a. to the left b. to the right c. upward d. downward e. "into the paper" f. "out of the paper" Use the right-hand-rule, determine the direction of the magnetic force on a current carrying strip in the following diagram, where the magnetic field is perpendicular to the surface to this paper: The magnetic force on the current strip is directed: a. to the left b. to the right c. upward d. downward e. 'into the paper" f. "out of the paper"

Explanation / Answer

Right hand rule dtermines the   directions of magnetic force, conventional current and the magnetic fields.

1)

Here, magnetic field is parallel to the surface.

Therefore, the magnetic force acts towards upward.

The correct option is C

2)

Here, magnetic field is perpendicular to the surface.

Therefore, the magnetic force acts out of the paper.

The correct option is F.

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