Title: Exp8
Course: مختبر فيزياء عامه 2 الشعبة 10 عملي

Q: Kh-10M. A student measures the angle of the compass of the tangent galvanometer respect to the earth magnetic field B_e (S-N), when the plane of the coil of the galvanometer is parallel to the earth’s magnetic field, and obtain an angle = 45^o^ and current I= 20 mA.

What is the number of turns of the circular coils of the tangent galvanometer of diameter 15 cm, if the horizontal earth’s magnetic field is 40 micro Tesla?
- 400
- 239
- 398
- 120
A: 239

Q: Kh-12E. in the Fig. shown the compass of the tangent galvanometer makes angle θ with respect to the earth magnetic field B_e (S-N), when the plane of the coil is parallel to the earth’s magnetic field.

The magnetic field produced by the coil is pointing  in the direction of:

[Image]
- East
- West
- North
- South
A: West

Q: Kh-13E. If the compass of the tangent galvanometer makes angle θ with respect to the earth magnetic field B_e (S-N), when the plane of the coil is parallel to the earth’s magnetic field is as shown in Fig.

What is the direction of the current in the coil?

[Image]
- Clockwise
- Counterclockwise
- In the direction of the magnetic field of coil.
- Cannot be determined
A: Clockwise

Q: Kh-1M. For the Fig. shown the of the angle of the compass is 45^o with respect to the earth magnetic field Be (S-N). The plane of the coil of the galvanometer is parallel B_e.

[Image]What is the magnitude of the horizontal magnetic field  of the earth Be (in micro Tesla) if the current in the coil I = 7.5 mA.  (The number of turns of the coil is N=500, the diameter is 15 cm)
- 31.4
- 55.8
- 62.8
- 25.5
A: 31.4

Q: Kh-8H. A student measures the angle of the compass of the tangent galvanometer respect to the earth magnetic field B_e (S-N), when the plane of the coil of the galvanometer is parallel to the earth’s magnetic field, and obtain an angle α= 38^o^ and current I= 10 mA.

What is the current in mA when the angle α is 50^o?
- 15.3
- 20
- 12.5
- 20.1
A: 15.3

Q: Kh-8H. A student measures the angle of the compass of the tangent galvanometer respect to the earth magnetic field B_e (S-N), when the plane of the coil of the galvanometer is parallel to the earth’s magnetic field, and obtain an angle = 38^o^ and current I= 6 mA.

What is the current in mA when the angle is 50^o?
- 9.15
- 3.93
- 12.51
- 20.1
A: 9.15

Q: Kh-9M. A student measures the angle of the compass of the tangent galvanometer respect to the earth magnetic field B_e (S-N), when the plane of the coil of the galvanometer is parallel to the earth’s magnetic field.  If the  angle = 45^o^ and current I= 10 mA.

The diameter of the coil is 10cm. when B_e = 60 micro Tesla,

what is the number of turns N?
- 477
- 500
- 398
- 250
A: 477