Recent content by Shinwasha

Homework Statement A lens has a radius of curvature of magnitude R on its left surface and a radius of curvature of magnitude 2R on its right surface. Parallel rays entering the lens from the left are focused to a point 135mm to the right of the right surface. At what distance from the lens is...

It is actually easier for me to use numbers than variables because I find it easier to relate values to something.

I think I got it now. Using Ohm's law V=IR For case 1 V = 2(3.0+Ri) V= 6+2Ri Case 2 V = 3(1.0+Ri) V = 3.0+3Ri 6+2Ri= 3+3Ri 3 = Ri Thus Emf = 6.0+2*3 EMF = 12 Just wasn't seeing the R part as having to pieces.

Which doesn't add up with the values I have. If in the second case the current was 6 amperes it would make sense. But since Current = EMF/Resistance it doesn't in this case. Only thing I could think of here is the -IR is the same thing as V.

The only thing I can possibly see is to take the EMF (which is unknown). Looking through the book I'm not seeing anything, and using google every thing I seeing gives one of the two unknowns. It seems like there just isn't enough information and that the voltage using V=IR should be the same in...

Homework Statement When a nonideal battery is connected to a 3.0-Ω resistor in a circuit, the current in the circuit is 2.0A . When the same battery is connected to a 1.0-Ω resistor in a circuit, the current in the circuit is 3.0 A. What is the internal resistance of the battery? What is the...

Homework Statement [/B] A uniform magnetic field exists in a cubic volume of space with a 50-mm side length. If the magnetic energy stored in this volume is 19J , what is the magnetic field magnitude? (This is all the information I got. Been a bad week for since it just seem information for my...

The space to the right of the y-axis contains a uniform magnetic field of unknown magnitude that points in the positive z direction. As a conducting square loop placed in the xy plane (oriented with its horizontal and vertical sides parallel to the x and y axes) moves to the right across the...

Magnetic Field is constant, the direction is into the positive z direction (guess I missed that part). I've tried to use ΔΦ/Δt, but not sure I did it right. Tried to take that fact it's traveling at 2m/s and the loop is 0.30 that Δt= 0.30m/2m/s giving me 0.15 seconds to go through completely...

Homework Statement A conducting square loop placed in the xy plane (oriented with its horizontal and vertical sides parallel to the x and y axes) moves to the right across the y-axis at a constant speed of 2.0 m/s, a 0.63-V emf is induced in the loop. If the side length of the loop is 0.30 m...

Homework Statement A square conducting loop lies in the xy plane of an xyz coordinate system. The loop is in a uniform magnetic field that points in the positive z direction and is decreasing at a rate of 0.070 T/s. What are (a) the magnitude of the induced EMF in the loop and (b) the direction...

An electron enters one end of a solenoid at a 65 degree angle to the horizontal. The solenoid carries a 10-a Counterclockwise current. The Solenoid is made from a 33.0m length of wire and as 400 turns in 0.2m of length. (a) ignoring end effects, what is the smallest time interval required for...

I meant question not the equation, which gives no radius of the solenoid and only the length. The trajectory would be a line through the solenoid since the magnetic field lines are compressed to that point is my way of thinking. The other thought I have is that it it will continue on it's arcing...

It enters the solenoid from a 65 degree angle below the solenoid (That's what the equation states) which is also the trajectory. N stands for the number of turns in the solenoid and no radius for the solenoid is given. It's asking without striking the coils what is the minimum amount of time it...

Homework Statement An electron enters a solenoid at 65 degrees below a solenoid. The solenoid has a 10 A clockwise current is 33.0 m long and has 400 turns. Ignoring end effects what is the shortest amount of time in which the electron pass through the solenoid? Homework Equations Only one I...