If the identical coils have radii of 1.17 cm and are 2.31 cm apart, with 38 turns of wire apiece, what current should they both carry to produce a magnetic field of 4.40 10-5 T halfway between them

0.0133 A

Explanation:

We are given that

Radius of coil=r=1.17 cm=

1 m=100 cm

Distance between the coil=d=2.13 cm=0.0213 m

Number of turns=N=38

2 N=2(38)=76

Magnetic field produced in coils=B=

Magnetic field along the axis of symmetry of loop wire

Substitute the values

I=0.0133 A

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here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be