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Clock spring balance
A sensitive balance for use among 0-1 g or 1-10 g is readily made using a piece of clock spring and a block of wood or cotton reel.
Fasten the wooden block or cotton reel down to a convenient base. Fix a piece of watch spring about U) cm long to it and make a cardboard or paper conical pan. Fix the pan to the spring near the free end using sealing wax or cements suggested in Chapter XVIII. Use the free end as a pointer, and a postcard as a scale, and calibrate it by putting weights in the pan. The sensitivity depends on the spring used, but the scale is a reasonably open one.
What is a zone plate? How is it constructed? Show that a zone plate behaves like a convex lens. Deduce the expression for its focal length
Core type Transformers: In this type of transformer the windings enclose the core (fig. given below). Both the windings are divided and half of every winding is placed on eac
A positively-charged subdivision is moving southward in a downward-directed uniform magnetic field. The magnetic force is the merely force if any acting on the particle. Throughout
which theorem is better among all network theorems
Anode rays were discovered by: (1)Goldstein (b)J. Stoney (3)Rutherford (4)J.J. Thomson Ans: (1)Goldstein
Determine the potential and field due to a short dipole of dipole moment 5.0 X 10 -16 coulomb-cm at a point distant 1 cm from it. (a) on its axis (b) on its perpendicular bi
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In the mass spectrograph, two positively charged ions having the similar velocity pass through a slit and enter a uniform magnetic field at right angles to their initial velocities
A sensitive beam balance The materials required for this balance contain a clothes peg, a knitting needle about 12 in. long, two pins or needles and a support like as a milk bo
In thermodynamics, the Joule-Thomson effect describes a process in which a fluid is forced through a valve or porous plug while kept insulated so that no heat is exchanged with the
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