Unit 13 Test - Magnetic Forces

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Mr. Hermes Instructor

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1. The Earth is essentially one large magnet. Is the magnetic field produced by the Earth stronger at the equator or at the poles?

Strongest at the Equator

Strongest at the Poles

Equally Strong at the Equator and the Poles

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2. As early as the 12th century, the Chinese used compasses for navigating ships. If the needle on a compass points North, what is the orientation of the tip of the compass needle?

The tip is a north pole

The tip is a south pole

The tip is neutral pole

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3. You are drawing the field lines around a bar magnet. You first draw the lines at the south pole of the magnet. Which way do the vector arrows point at the south pole?

Into the south pole.

Out of the south pole

Tangent to the south pole

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4. Iron filings act like small bar magnets. If iron fillings are scattered around a magnetized pole stuck vertically in the ground, what shape will the iron fillings take?

Parallel Lines

Concentric Ellipses

Concentric Circles

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5. A scientist runs a current through a vertical wire on her lab table. She notices that the magnetic field produced runs clockwise (the same way clock's minute/hour hands move) around the wire. Using the Right Hand Rule, which direction is the current running?

Counter-Clockwise

Top to Bottom

Bottom to Top

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6. In a Circular Coil the magnetic field lines take which shape?

Parallel Lines

Concentric Ellipses

Concentric Circles

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7. What describes the magnetic field within a solenoid?

Strongest at the poles.

Strongest in the middle

Uniform throughout.

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8. The strength of a solenoid field can be increased by doing what to the coils?

Increasing the length of the coil.

Increasing the density of the coil.

Increasing the radius of the coil.

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9. What is the difference between a solenoid and electromagnet?

The solenoid uses coils to create a magnetic field.

The electromagnet has electricity running through it.

The electromagnet has an magnetic core inside it.

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10. A security gate is controlled by a 1200 lb. electromagnetic lock. During an emergency, medical personnel are locked outside. A locksmith is called to the scene. What is the quickest way to for the locksmith to open the gate and let the medical personal enter the gates?

Increase the current to the lock.

Reverse the current to the lock.

Cut the current to the lock.

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