ENGINEERING THE SIMPLEST GRAVITY CONTROL CELL

ENGINEERING THE SIMPLEST GRAVITY CONTROL CELL BY

Fran De Aquino Physics Department, Maranhao State University- UEMA, Brazil deaquino@uema.br

2009

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ENGINEERING THE SIMPLEST GRAVITY CONTROL CELL

(1) Aluminum foil (7.5m X 0.45m; 10.5 microns thickness)

(2) Chemical characteristics

Al 98.02%; Fe 0.80%; Si 0.70%; Mn 0.10%; Cu 0.10%; Zn 0.10%; Ti 0.08%; Mg 0.05%; Cr 0.05%.

(3)

A 15cm square Aluminum foil of 10.5 microns thickness with the following characteristics: μr =1; σ = 3.82×107 S.m−1 ; ρ = 2700Kg.m−3

(4)

A 17 cm square Foam Board plate of 6mm thickness

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(4)

Foam Board

(5)

The 15cm square Aluminum foil of 10.5 microns thickness fixed on the 17 cm square Foam Board

(6) Ends of the connections

(7) The Simplest GCC (finished)

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Flexible Copper Wire # 12 AWG 15 cm square Aluminum foil (10.5 microns thickness)

Gum (Loctite Super Bonder) 17 cm square Foam Board plate (6mm thickness)

Aluminum foil

Foam Board

Fig. A – Details of the Simplest Gravity Control Cell (GCC).

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Dynamometer

50 mm

Sample Aluminum foil

Foam Board

GCC

Flexible Copper wire # 12 AWG

Pan balance

Battery 12V

r2* < 0 .1Ω

Rr Rheostat

ε2 0.60 Ω -100W

0.36 Ω - 60W Oscilloscope

Function Generation

HP3325A ε1

350Ω - 1W

Fig. B – Experimental Set-up.

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ε1

R1*

r1*

~ f = 20 μHz

I1

I2

ε2

r2*

RL

R 2*

+ −

I3

r p*

R *p

ε 1 = 7.5 V (rms ) Function Generator HP3325A r1* = 50Ω R1* = 350 Ω − 1 W

ε 2 = 12V DC

r2* < 0.1Ω (Battery ) R 2* = 0.60Ω − 100W r p* = 2.5 × 10 −3 Ω R *p = 0.36Ω − 60W I 1max = 30 mA (rms ) I 2max = 12.5 A

I 3max ≅ 12.5 A (rms )

Fig. C – Equivalent Electric Circuit