A circular coil with radius 10 cm and 50 turns carries a current of 0.5 A in eac
ID: 3308826 • Letter: A
Question
A circular coil with radius 10 cm and 50 turns carries a current of 0.5 A in each turn. What is the magnetic field 1 m from the coil along its axis?
0 T
1.5x10^-7 T
1.5x10^-6 T
3.0x10^-9 T
Two long, straight wires are separated by 1 cm. Each carries 1.4 A of current. The wires are parallel to each other, and the currents flow in the same direction. What is the magnitude of the force per unit length on the wires?
2.0x10^-5 N/m
0 T
3.9x10^-7 T
3.9x10^-5 N/m
a.0 T
b.1.5x10^-7 T
c.1.5x10^-6 T
d.3.0x10^-9 T
Two long, straight wires are separated by 1 cm. Each carries 1.4 A of current. The wires are parallel to each other, and the currents flow in the same direction. What is the magnitude of the force per unit length on the wires?
a.2.0x10^-5 N/m
b.0 T
c.3.9x10^-7 T
d.3.9x10^-5 N/m
Explanation / Answer
field at a point on axis,
B = u0 N I a^2 / 2(x^2 + a^2)^(3/2)
B = (4pi x 10^-7)(50)(0.5)(0.10^2) / 2 (1^2 + 0.10^2)^(3/2)
B = 1.5 x 10^-7 T ........Ans (b)
---------------------------
F /L = u0 I1 I2 / (2 pi r)
= (4 pi x 10^-7)(1.4)(1.4) / (2 pi 0.01)
= 3.9 x 10^-5 N/m
Ans(d)
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