# Answer to Question #55899 in Electromagnetism for kola

Question #55899

What is the self - inductance of an air-core solenoid, 1m long and 0.05m in diameter, if it has 1400 turns?

5.23mH

4.84mH

3.63mH

2.42mH

17 Which of the following is NOT correct?

A changing electric field can produce a changing magnetic field

A steady magnetic field produces a steady current

A changing magnetic field can produce a changing current

A changing magnetic field can produce a steady electric field

18 A rectangular coil of dimensions 20cm by 15cm lies with its plane parallel to a magnetic field of

0.5W/m2

. The coil, carrying a current of 10A experiences a torque of 4.5Nm in the field. How many loops has the coil?

100

60

30

20

5.23mH

4.84mH

3.63mH

2.42mH

17 Which of the following is NOT correct?

A changing electric field can produce a changing magnetic field

A steady magnetic field produces a steady current

A changing magnetic field can produce a changing current

A changing magnetic field can produce a steady electric field

18 A rectangular coil of dimensions 20cm by 15cm lies with its plane parallel to a magnetic field of

0.5W/m2

. The coil, carrying a current of 10A experiences a torque of 4.5Nm in the field. How many loops has the coil?

100

60

30

20

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