Physics Videos

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  1. A circuit has the following R = 20 \(\Omega\), C = 25 \(\mu\)F, \(\Delta{V}_C\) = 10 V.

    How long will it take for the charge to drop to one third its original value?

  2. Determine the direction of the magnetic force acting on the proton or electron in each situation below.

    A. magnetic force and right hand rule physics example

    B. magnetic force practice problem

    C. magnetic force problems and answers

  3. A straight wire carries a current of 30 A in the north direction. Find the magnetic field 3.0 m directly below the wire.

  4. How do magnets work?

  5. Two long straight parallel wires are separated by a distance of 25 cm. One is carrying a current of 2 A, the other 4 A (the currents are aimed in the same direction) . What is the magnetic field, \(\vec{B}\) at a point directly in the middle of the wires?

  6. Three long wires parallel to the x axis carry currents as shown below. If I = 20 A, what is the magnetic field at the origin (magnitude and direction) ?

    magnetic field of a wire

  7. The picture below depicts a wire carrying a current I = 25.0 A. The shape of the wire is two combined arcs with r\(_1\) = 9.0 cm and r\(_2\) = 6.0 cm. Find the magnetic field at the center of the arcs (in blue).

    magnetic field due to current video

  8. An electron is accelerated from rest through a potential difference of 1200 V. It then enters a region where a magnetic field of 80 \(\mu\)T is oriented perpendicular to the electrons motion. What is the radius of the electron's motion in the magnetic field?

  9. A region of the rectangular wire loop shown below sits in a uniform magnetic field directed into the page, \(\vec{B}\) = 7.0 T. The coil is being pulled to the right (shown in blue) at a velocity of 3 m/s. Note that the loop is being pulled into a region that does not contain a magnetic field. Find the:

    Motional EMF

    A. Magnitude of the induced EMF

    B. Current and its direction

    C. Force required to pull the wire loop at constant velocity

  10. A magnetic field increases with time as described by the function, B(t) = 4 + 6t. Given a coil with 880 turns, N = 880, and an area A = (.05m)\(^2\), find the induced voltage in the coil.

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