The magnetic force on a wire 274 cm long is . if electrons move through the wire in 1.90 s, what is the magnitude of magnetic field that is perpendicular to the wire?

Matter & Energy

Math Review

Kinematics  

Defining Motion

Graphing Motion

Kinematic Equations

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Relative Velocity

Dynamics

Newton's 1st Law

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Newton's 2nd Law

Static Equilibrium

Newton's 3rd Law

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Atwood Machines

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Conservation Laws

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Center of Mass

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Rotational Kinematics

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Bernoulli's Principle

Thermal Physics  

Temperature

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Electrostatics  

Electric Charges

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Magnetism  

Magnetic Fields

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Waves & Sound  

Wave Characteristics

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Modern Physics  

Wave-Particle Duality

Models of the Atom

M-E Equivalence

The Standard Model

Relativity

MAGNETISM

Magnetic Fields

The Compass

Electromagnetism  

Electromagnetism

In 1820, Danish physicist Hans Christian Oersted found that a current running through a wire created a magnetic field, kicking off the modern study of electromagnetism.

Moving electric charges create magnetic fields. You can test this by placing a compass near a current-carrying wire. The compass will line up with the induced magnetic field.

To determine the direction of the electrically-induced magnetic field due to a long straight current-carrying wire, use the first right hand rule (RHR) by pointing your right-hand thumb in the direction of positive current flow. The curve of your fingers then shows the direction of the magnetic field around a wire (depicted at right).

You can obtain an even stronger magnetic field by wrapping a coil of wire in a series of loops known as a solenoid and flowing current through the wire. This is known as an electromagnet. You can make the magnetic field from the electromagnet even stronger by placing a piece of iron inside the coils of wire. The second right hand rule tells you the direction of the magnetic field due to an electromagnet. Wrap your fingers around the solenoid in the direction of positive current flow. Your thumb will point toward the north end of the induced magnetic field, as shown below.

Explanation:

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.