Questions
A long straight vertical wire carries a current of 10 A flowing upwards through it at a place where the horizontal component of the earth's magnetic induction is 0.3 gauss. Then the total magnetic induction at a point 5 cm from the wire due magnetic north of the wire is
detailed solution
Correct option is B
The magnetic induction B due to a current I ampere in a long straight conductor at a distance r metre from it is given byB=μ04π × 2IrHere I=10 A, r=5 cm = 5 × 10−2 mB=10−7 × 2 × 105 × 10−2 = 0.4 gaussSince the point is due to magnetic north of the conductor, the line of action of B→ is along east-west direction. Magnetic induction due to earth's horizontal component is 0.3 gauss in a direction from south to north.Resultant magnetic induction Br is given by Br = 0.42 + 0.32 = 0.5 gaussTalk to our academic expert!
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Four long insulated current carrying wires, cross each other as shown in the figure. If the separation between any pair of parallel wires is d, the magnetic induction at O is
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