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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
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