Welcome to Physics Jeopardy Chapter 18

Final Jeopardy Question Magnetic fields 100 Electro magnetic Induction Motor Transformers Right Hand Rules

Back Magnetic Fields 100 pts If two magnets are attracted to one anther their poles must be?

Opposite Back Magnetic field 100 pts Answer

Back Magnetic field 200 pts Can a magnet ever have a single pole? Why or why not?

No, Poles are regions of strong magnetism on each end of the magnet, the magnetic field lines are continuous Back Magnetic field 200 pts

What kind of material is a lodestone made of? Back Magnetic field 300 pts

Ferromagnetic Back Magnetic Field 300 pts

Back Magnetic Field 400pts What causes a nail to become a temporary magnet?

The domains of the nail align themselves with a permanent magnet. Back Magnetic Field 400 pts Answer

Back Magnetic Field 500 pts What does a magnetic domain refer to?

Back Magnetic Field 500pts Answer Small magnetic regions caused from electron spin

Back Right hand rule 100pts X Determine the magnetic field of the wire with a current going into the page.

Clockwise Back Right Hand Rule 100 pts

Back Right hand Rule 200 pts A current flows west to east in a wire. Determine the direction a compass will point above the wire.

Back Right Hand Rule 200pts Answer South

Back Right Hand Rule 300 pts + What is the direction of the magnetic field Of the above electromagnet?

Back Right Hand Rule 300 pts NS S S N

Back The direction that the force has on a current carrying wire is ___ the external magnetic field Right Hand Rule 400

Perpendicular Back Right Hand Rule 400 pts Answer

12.The force exerted on a current carrying wire depends on ___ &___& ___ Back Right Hand Rule 500 pts

Back Right and Rule 500 pts Answer F= BIL Magnetic field, Current, Length of wire

Back Motor 100 pts The speed of a motor can be increased by increasing the _____?

Back Motor 100 pts Answer Current

Back Motor 200pts What is the principle behind the electric motor?

Back A current carrying conductor placed perpendicular to a magnetic field will experience a force Motor 200pts Answer

Back Motor 300pts What are the essential parts to a motor?

Back Motor 300pts Answer Armature, Split rings, magnetic field, brushes

Back A motor that rotates clockwise has a magnetic field going from left to right What are the poles on the red and blue bobbins as they rotate?

Red and Blue top – North Red and Blue bottom - South Back

Why must the coils be wound in opposite directions around the armature?

The polarity of the two electromagnets must be opposite. Back

Electromagnetic Induction 100pts What is the force on a 120 cm long wire perpendicular to a external magnetic field of.500 T with a current of 4.00 amps moving through the wire?

Back 2.4 N

Back Electromagnetic Induction 200pts How can a electric current be generated in a wire without a battery?

Back Moved perpendicular across a magnetic field

Back Electromagnetic Induction 300pts What does EMF depend on?

Back B Magnetic field v Velocity l Length of wire

Back Electromagnetic Induction 400pts The Max Emf will be induced in a wire moving in a magnetic field when the wire moves

Back Perpendicular to the magnetic field lines

Back Electromagnetic Induction 500pts What is the EMF for a.6m long wire is moved at right angles to the lines of force of a magnetic field whose strength is 0.3T at a speed of 2.0m/s The induced EMF in the wire is

Back.36 V

What is the difference between generators and motors? Back

Motor converts electricity to mechanical energy Generators converts mechanical energy to electrical energy Back

What parts of a DC generator convert the AC in the armature to the DC in the external circuit? Back

The split rings and brushes

A device consisting of a coil that is mechanically rotated in a stationary magnetic field is called? Back

Generator

Back In a transformer the primary coil is connected to the _________ and the secondary coil is connected to the __________

Back Primary ->Power supply Secondary -> load

Back A step up transformer has a primary coil of 800turns and is connected to a 120 V source. How many turns Would be needed in the secondary coil to supply 60 V.

Back 400 Coils

When was the internet developed? Back

1960’s Back