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The observed values of Fore Bearing and Back Bearing of line AB are 60°30' and 240°0' respectively. What will be the correction due to local attraction at the station, if any?
- a)+30'
- b)-30'
- c)+15'
- d)There is no local attraction
Correct answer is option 'A'. Can you explain this answer?
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Most Upvoted Answer
The observed values of Fore Bearing and Back Bearing of line AB are 60...
Local Attraction- In presence of magnetic materials, the magnetic needle deviates from the magnetic meridian and thus provides wrong direction of a line. The deviation arising from such local sources is called local attraction.
If the fore bearing and back bearing of a line does not differ by 180°, then there is a possibility of local attraction during the observation of the line.
Observed Back bearing of AB = 240°
Correct Back bearing of AB = 60°30' + 180° = 240°30'
Error at station B = 240°30' -240° = - 30'
There is a local attraction of 30'
Correction at station B = +30'
If the fore bearing and back bearing of a line does not differ by 180°, then there is a possibility of local attraction during the observation of the line.
Observed Back bearing of AB = 240°
Correct Back bearing of AB = 60°30' + 180° = 240°30'
Error at station B = 240°30' -240° = - 30'
There is a local attraction of 30'
Correction at station B = +30'
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The observed values of Fore Bearing and Back Bearing of line AB are 60...
Given Data:
- Fore Bearing of line AB = 60°30
- Back Bearing of line AB = 240°0
Calculation:
- Local Attraction Correction = Back Bearing - Fore Bearing
- Local Attraction Correction = 240°0 - 60°30
- Local Attraction Correction = 179°30
Explanation:
- The local attraction correction is calculated by subtracting the Fore Bearing from the Back Bearing of the line AB.
- In this case, the Back Bearing is greater than the Fore Bearing, indicating that there is a local attraction at the station.
- The correction due to local attraction is +179°30, which means that the correct bearing of the line AB should be 179°30 more than what was originally observed.
- Therefore, the correct option is +30, indicating that the correction due to local attraction at the station is +30°.
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The observed values of Fore Bearing and Back Bearing of line AB are 60°30 and 240°0 respectively. What will be the correction due to local attraction at the station, if any?a)+30b)-30c)+15d)There is no local attractionCorrect answer is option 'A'. Can you explain this answer?
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