Question

Textbook of + 2 Physics-
EXERCISES
• Calculate the magnetic flux dersity, at a point, distant 2 m from a long straight wire carrying a current
of 3 A.
(Ans. 3 x 10-7 T)
Determine the strength of magnetic field, in air, 0.01 m away from an infinitely long wire which carries
a current of 2 A.
[Ans. 4 x 10-5 T
A straight wire carries a current of 3 A. Calculate the magnitude of the magnetic field, at a point, 15 cm
away from the wire. Draw the diagram to show the magnetic field.
(Ans. 4 x 10- T]
length 4A wire of total4 cm is into a square. It carriesbent a current of 10 A. Obtain the magnitude of
the field at the centre of the square.
[1.028 x 10 T7
A vertical straight wire in which a current of one ampere is flowing is placed in the magnetic field of
earth where H = 0.3 x 10- Tesla. Find the distance of neutral point.
[Ans. 6.6 x 10-3 m]
A horizontal overhead power line carries a current of 90 A in the east to west direction. What is the
magnitude and direction of magntic field due to the current, 1.5 m below the line ? [Ans. 4 x 10-6 T
A wire is stretched between two poles and carries a current of 50 A. The height of the wire above the
ground is 10 m. Find the magnetic field at a point on the ground vertically below the wire.
(Ans. 10 tesla
A long wire carries a current of 18 ampere in the vertically upward direction. The neutral point is located
at a distance of 1 metre from the wire. Calculate the value of horizontal component of earth's magnetic
field at that point.
(Ans. 3.6 x 105 T)
AGNETIC FIELD AT THE CENTRE OF A CIRCULAR COIL CARRYING CURREN
Consider a circular loop of radius r'
Let​

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