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# CBSE Class 12 Physics Demonstration Data

More data, this time, for the Class XII Physics Demonstrations…

Tangent Law Demonstration

Number of turns used = 2
Internal diameter of coil = 0.14 m
External diameter of coil = 0.1414 m

Least count of ammeter = 0.25 A

Zero error of ammeter = 0 A
 S. No. Number of turns (n) Current (I) Deflection (θ) tan θ 1 2 0.75 22.5 0.4142 2 2 1.5 40 0.8391 3 2 1.75 45 1 4 2 2 50 1.91

Calculations:
Mean diameter of coil = 0.14 m
Mean radius of coil = 0.07 m
Value of horizontal component of Earth’s magnetic field:

1. H1 = 3.24 x 10^-5 tesla
2. H2 = 3.2 x 10^-5 tesla
3. H3 = 3.14 x 10^-5 tesla

Mean value of H = 3.19 x 10^-5 tesla

Result:
Experimental value of H = 3.19 x 10^-5 tesla
Actual value of H = 3.2 x 10^-5 tesla
Difference = 0.01 x 10^-5 tesla
% error = 3.125%

Refractive Index Demonstration

Rough focal length of convex lens = 10 cm

 Arrangement Height of tip of optical needle Focal length (x cm) from lens surface x1 cm from plane mirror x2 cm Mean x cm Convex lens on plane mirror 9.8 10.2 10 fg = 10 Convex lens on plane mirror with water in between 14.8 15.2 15 F = 15 Convex lens on plane mirror with glycerol in between 20.8 21.2 21 F = 21

Calculations:

1. R = f = 10 cm
2. fwater = -30 cm
3. fglycerol = -19 cm
4. Refractive index of water = 1.33
5. Refractive index of glycerol = 1.53

## 15 replies on “CBSE Class 12 Physics Demonstration Data”  jitendersays:

I didn’t found the demonstration experiment based on induced emf & diffraction of light  Mr Gmailsays:

i need a class 12 physics demonstration file without any calculation and observation table!!!
pls help!!!  PRIYANSHUsays:

THANX, WHREVR U R BUDDY………………………..  rahulsays:

bhai.. demonstration files bhi upload karde pk\zzz  ryrulessays:

Thanks a lot Sirji!!!!i myself am frm DPS Vk…got my prac next week n abhi tak file ka koi ata pata nahi hai…I owe u truly

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