PH 203 Recitation Homework Summer 2008

 

Chapter 19

 

There is an equilateral triangle with one point charge at each vertex. The point charges have charges of +Q, +2Q and -4Q respectively. The length of one side of the triangle is L. Determine an expression in simplest form for the potential (or voltage) at a point halfway between the +Q and +2Q point charges. Simplest form means that the answer is factored completely and consists of only one simple fraction.

 

Chapter 20

 

A circuit consists of a resistor of resistance R connected across the terminals of a battery. The current through the resistor is 5.00 A in this configuration. When another resistor of resistance 2.00 Ohms is inserted into the circuit in series with the other resistor, the current decreases to 4.00 A. What is R?

 

Chapter 23

 

A series RLC circuit has a resonant frequency of 6.00 kHz and a resistance of 575 Ohms. When connected to an AC power supply that varies the voltage at 8.00 kHz, its impedance is 1.00 kOhm. What are the capacitance and inductance of the circuit?

 

Chapter 21

 

A source produces 6Li ions, which have an electrical charge of +1.60 x 10-19 C and a mass of 9.99 x 10-27 kg. The ions are accelerated from rest through a potential difference of 10.0 kV and pass horizontally into a region in which there is a uniform magnetic field of magnitude 1.20 T in the vertical direction. What is the diameter of the circle around which the 6Li ions consequently move?

 

Chapter 22

 

An electric generator consists of 100 loops of wire. Each loop is a rectangle 50.0 cm wide and 30.0 cm long. The loops spin at 1000 rev/min in a uniform magnetic field of magnitude 0.350 T. What is the maximum value of the induced EMF? What is the frequency of the induced EMF?

 

Chapter 24

 

Sunlight just outside the Earth's atmosphere has an intensity of 1.40 kW/m2. What are the maximum magnitudes of the electric and magnetic fields for sunlight at this location?

 

Chapter 25

 

An object is located 1.00 m from a concave mirror. When viewed in the mirror, its image is inverted and is twice as tall as the object. What is the radius of curvature of the mirror?