Anegative charge of 0.590 μc exerts an upward 0.800-n force on an unknown charge that is located 0.500 m directly below the first charge. part a what is the value of the unknown charge (magnitude and sign)? express your answer with the appropriate units. q= 1 value units submit request answer part b what is the magnitude of the force that the unknown charge exerts on the 0.590 μc charge? express your answer with the appropriate units. value units

Explain why the aperture of the spherical mirror should be small compared to the radius of curvature of the mirror.

The membrane surrounding a living cell consists of an inner and an outer wall that are separated by a small space. assume that the membrane acts like a parallel plate capacitor in which the effective charge density on the inner and outer walls has a magnitude of 7.0 × 10-6 c/m2. (a) what is the magnitude of the electric field within the cell membrane? (b) find the magnitude of the electric force that would be exerted on a potassium ion (k+; charge = +e) placed inside the membrane.

Which branches of natural science include the study of an organism that lived 10 million years ago