4 A square ammeter has sides length 3.00 cm. The sides of the ammeter are capabl

Question

4 A square ammeter has sides length 3.00 cm. The sides of the ammeter are capable of measuring the magnetic field they are subject to. When the ammeter is clamped around a wire carrying a direct current, as shown in the figure, the average value of the magnetic field measured in the sides is 4.00 G. What is the current in the wire? A coaxial cable consists of an insulated wire carrying current I_1=4.00 A surrounded by a conductor carrying current I_2 = 1.50A in the oppositive direction. calculate magnetic field inside the cylindrical conductor at r_int = 0.500 cm calculate magnetic field outside the cylindrical conductor at r_ext = 1.50 cm.

Explanation / Answer

Q4)

Ampere's law: Bd = µo I

B2r = µoI

I = B2r / µo = (4x10^-4)2(0.03/2) / 4x10^-7

I = 30 A

Ans- Current is 30A

Qs 5)

a) B2r = µoI

B=µoI /2r

=4x3.14x10^-7x4/2x3.14x0.5x10^-2

=0.00016T Ans

b)B=µoI /2r

=4x3.14x10^-7x1.5/2x3.14x1.5x10^-2

=0.0000133T Ans

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