Which of the following statements is not true? a. The pattern of the magnetic field lines around...

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Which of the following statements is not true?
a. The pattern of the magnetic field lines around a current carrying conductor depends on the shape of the conductor
b. The magnetic field lines produced by a solenoid carrying current is similar to that of a bar magnet
c. Magnitude of magnetic field is directly proportional to the amount of current flowing through the wire
d. Magnetic field produced by the passage of current through a straight wire is permanent
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