Projectiles in an Electric Field

Multi-Loop Circuit

Instructions
This simulation applies Kirchoff's circuit rules to a multi-loop circuit with three branches. The resistance of each resistor and the emf of each battery can be changed using the sliders. Set a resistance or emf to zero to remove it from the circuit. Positive emf represents a battery with positive terminal upwards, while negative emf represents positive terminal downwards.[br][br]The initial guess for the direction of each current can be selected from the drop-down list. Similarly, drop down lists are used to select where to apply Kirchoff's rules.
[list=1][*]What effect does changing the initial guess for the direction of a current have on the final solution?[/*][*]What effect does changing a loop direction have on the produced equation?[/*][*]Some combinations of resistance and emf result in an infinite or undefined current. Why?[/*][*]Can you find a combination of values that results in zero current throughout the entire circuit (with at least one nonzero emf)?[br][/*][/list]

Point Charge in a Magnetic Field

Instructions
This simulation shows the motion of a point charge in a uniform magnetic field. Adjust the charge, mass, and magnetic field using the sliders. Change the starting location and velocity of the point charge by dragging the points on either end of the velocity vector. Click on the play button in the bottom left corner to watch the point charge move. Click on the reset icon in the top right if your point charge goes off the screen.
[list=1][*]Use the right hand rule to verify that the point charge is moving in the correct direction.[/*][*]Can you make a positive point charge move in a counterclockwise circle?[/*][*]How does each parameter affect the radius of the circle made?[/*][*]Is the time it takes to complete a circle (i.e., the period) dependent on the initial velocity?[/*][/list]

Electromagnetic Waves

This is a simple animation representing an electromagnetic wave. The green vectors show the fluctuation of the electric field, the red vectors show the fluctuation of the magnetic field.

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