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A converging lens with focal length of 11.8 cm is placed in contact with a diverging lens with a focal length of 21.1 cm. What is the focal length of the combination?
Two 10-cm-diameter charged rings face each other, What is the electric field at the center of the left ring
The diffraction pattern produced by the aperture is observed on a screen at a distance of 4 m from the aperture. The power density at the centre of diffraction pattern is measured to be 7 W/m2.
Many communications satellites orbit the earth in geostationary orbits. (They appear to remain in the same positions in the sky for observers on the earth's surface.) If such a satellite orbits at a height of 40,000 km, estimation the time delay in a..
A parallel-plate capacitor is charged to an electric potential of 337 V by moving 3.95×1016 electrons from one plate to the other. How much work is done in charging the capacitor.
If John Glenn weighed 640 N on the Earth's surface, i) how much would be having weighed if his Mercury spacecraft had (hypothetically) remained at twice the distance from the center of the earth? ii) Why is it said that an astronaut is never truly..
An air-filled parallel plate capacitor with a plate spacing of 1.50 cm has a capacitance of 7.20 ?F. Calculate the dielectric constant of the inserted material
A drop of water on a countertop reflects light from a flower held 2.4 cm directly above it. The flower's diameter is 1.8 cm, What is the focal length of the water drop
If a curve with a radius of 85 is perfectly banked for a car traveling 71 , what should be the coefficient of static friction for a car not to skid when traveling at 86.
Two parallel conductive plates of area 0.3m2 hold equal-but-opposite charges of magnitude 30?C on either side. calculate the electric field between the plates
Compute the net electric flux through the hull of the submarine. Is the number of electric field lines leaving the submarine greater than, equal to, or less than the number entering it?
A tungsten filament incandescent light bulb emits spherical electromagnetic waves of 50 Watts isotropically. What is the radiation pressure
A light ray enters a glass slab at point A at an angle of 57.6° with respect to the surface normal and then undergoes total internal reflection at point B. What minimum value for the index of refraction of the glass can be inferred from this?
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