20.A solenoid 150 cm long with 1550 turns has a central magnetic field of 1.50 mT. Find the current through the coil. Which formula must be used for this problem? A. B = 2ar О в. Hol N- 2R B = В — F В % Il O D. F В 3 B = qvsin0

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20.A solenoid 150 cm long with 1550 turns has a central magnetic field of 1.50 mT. Find the current through the coil.
Which formula must be used for this problem?
А.
B =
2ar
О в.
Hol
N-
2R
B =
В —
F
B =
Il
O D.
F
В 3
B =
qvsin0
Transcribed Image Text:20.A solenoid 150 cm long with 1550 turns has a central magnetic field of 1.50 mT. Find the current through the coil. Which formula must be used for this problem? А. B = 2ar О в. Hol N- 2R B = В — F B = Il O D. F В 3 B = qvsin0
21.A long, straight wire allows 3.50 A through it. What is the magnitude of the magnetic field 25.0 cm from the wire? Express the answer in microTesla (pT). Write magnitude only, unit is already given.
OA.
N
2R
В
OB.
F
B =
Il
Hol
B =
2ar
OD.
F
B =
qvsine
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Transcribed Image Text:21.A long, straight wire allows 3.50 A through it. What is the magnitude of the magnetic field 25.0 cm from the wire? Express the answer in microTesla (pT). Write magnitude only, unit is already given. OA. N 2R В OB. F B = Il Hol B = 2ar OD. F B = qvsine Activate Win- Go to Settings to
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