Magnet Forces and Orientations

The video tutorial explains a physics problem involving three identical bar magnets. Magnet number one is vertically oriented with its north end below the south end. Magnet number two exerts an upward force of 1.5 millinewtons on magnet one, indicating like poles repel. A third magnet is introduced horizontally, and the resultant force on magnet one is calculated using the Pythagorean theorem, resulting in a force of 2.1 millinewtons at a 45-degree angle above the horizontal.

What is the orientation of the first magnet in the problem?

• North end above the south end

• North end below the south end

• Horizontally oriented

• South end below the north end

What is the force exerted by the second magnet on the first magnet?

• 0.5 millinewtons

• 3.0 millinewtons

• 1.5 millinewtons

• 2.5 millinewtons

Why must the second magnet have a like pole facing the first magnet?

• To increase the distance

• To repel the first magnet

• To neutralize the force

• To attract the first magnet

How is the third magnet oriented relative to the first magnet?

• Vertically below the first magnet

• Vertically above the first magnet

• Horizontally to the right of the first magnet

• Horizontally to the left of the first magnet

What is the distance between the north ends of the first and third magnets?

• 1.5 centimeters

• 3.0 centimeters

• 4.0 centimeters

• 2.5 centimeters

What is the force applied by the third magnet on the first magnet?

• 1.5 millinewtons

• 2.0 millinewtons

• 2.5 millinewtons

• 3.0 millinewtons

What is the angle of the resultant force on the first magnet?

• 45 degrees

• 30 degrees

• 90 degrees

• 60 degrees

What theorem is used to calculate the resultant force?

• Ohm's law

• Coulomb's law

• Newton's law

• Pythagorean theorem

What is the magnitude of the resultant force on the first magnet?

• 2.1 millinewtons

• 3.0 millinewtons

• 1.5 millinewtons

• 2.5 millinewtons

In which direction is the resultant force on the first magnet?

• 45 degrees below horizontal to the right

• 45 degrees above horizontal to the right

• 45 degrees above horizontal to the left

• 45 degrees below horizontal to the left