Question 2 A magnetic field points north and a wire has a current moving east. W

Question

Question 2

A magnetic field points north and a wire has a current moving east. Which direction does the magnetic force on the wire point?

Question 2 options: North, South, East. West, Up, Down, There is no force on the wire.

Question 3

A wire is placed in a region of space where there is a uniform magnetic field pointing south. The wire will feel no force from the magnetic field in which of the following circumstance (Choose all that apply. Hint: there are three correct answers.)

Question 3 options: The current moves north. The current moves south. The current moves east. The current moves west. The current moves up. The current moves down. There is no current.

Question 4 A magnetic field points north and a positively charged particle is moving west. Which direction does the magnetic force on the particle point?

Question 4 options: North South East West Up Down, or There is no force on the wire.

Explanation / Answer

Question 2

Place your right hand on the current carrying conductor with fingers pointing along the direction of current. Now curl your fingers towards magnetic field. The direction of thumb gives the direction of force acting on the conductor.

Therefore, the direction of magnetic force is upward.

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Question 3

The magnitude of magnetic force acting on the a current carrying conductor is,

From the above relation it is clear that the magnitude of magnetic force is equal to zero when the angle between magnetic field and current is equal to zero or and when there is no current passing through the wire.

So correct options are:

The current moves north, the current moves south and there is no current.

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Question 4

Place your right hand fingers pointing along the direction motion of charge (South). Now curl your fingers towards magnetic field (North). The direction of thumb (down) gives the direction of force acting on the conductor. Therefore the direction of thumb is downward.

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