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1. Finding the magnetic field

got it I can't post pics yet. but i got it anyway I was using the wrong thing for r on each magnetic field.
2. Finding the magnetic field

Homework Statement Two parallel wires are 5.60 cm apart and carry currents in opposite directions, as shown in the figure. Find the magnitude of the magnetic field at point P due to two 1.50-\,{\rm mm} segments of wire that are opposite each other and each 8.00 {\rm cm} from P...
3. W light bulb

Homework Statement A voltmeter with resistance R_V is connected across the terminals of a battery of emf EMF and internal resistance r. Find the potential difference V_meter measured by the voltmeter. Homework Equations v=IR Vab= Va -Vb The Attempt at a Solution tried using...
4. How real voltmeter works

Homework Statement A voltmeter with resistance R_V is connected across the terminals of a battery of emf EMF and internal resistance r. Find the potential difference V_meter measured by the voltmeter. Homework Equations v=IR Vab= Va -Vb The Attempt at a Solution tried using...

6. Electric Field Inside a Hydrogen Atom

Homework Statement A hydrogen atom is made up of a proton of charge + Q=1.60 \times 10^{ - 19}\; {\rm C} and an electron of charge - Q= - 1.60 \times 10^{ - 19}\; {\rm C}. The proton may be regarded as a point charge at r=0, the center of the atom. The motion of the electron causes its charge...
7. Two small insulating spheres with radius

thanks my problem was that I wasn't changing my units from micro coulombs to coulombs.
8. Two small insulating spheres with radius

Homework Statement Two small insulating spheres with radius 5.50×10−2 m are separated by a large center-to-center distance of 0.510 m. One sphere is negatively charged, with net charge -2.20 \mu C, and the other sphere is positively charged, with net charge 4.05 \mu C. The charge is...
9. Angular magnification of a microscope

no help that doesn't help
10. Angular magnification of a microscope

Homework Statement The image formed by a microscope objective with a focal length of 5.00\;{\rm mm} is 160\;{\rm mm} from its second focal point. The eyepiece has a focal length of 26.0\;{\rm mm}. What is the angular magnification of the microscope? Homework Equations The...
11. Find image distance multiple optics.

Homework Statement As shown in the figure View Figure the candle is at the center of curvature of the concave mirror, whose focal length is 10.0 {\rm cm}. The converging lens has a focal length of 32.0 {\rm cm} and is 85.0 {\rm cm} to the right of the candle. The candle is viewed looking...