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

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:

- H1 = 3.24 x 10^-5 tesla
- H2 = 3.2 x 10^-5 tesla
- 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:

- R = f = 10 cm
- fwater = -30 cm
- fglycerol = -19 cm
- Refractive index of water = 1.33
- Refractive index of glycerol = 1.53

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

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

i need a class 12 physics demonstration file without any calculation and observation table!!!

pls help!!!

THANX, WHREVR U R BUDDY………………………..

bhai.. demonstration files bhi upload karde pk\zzz

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