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A circular loop of wire 78 mm in radius carries a current of 114 A. Find the (a) magnetic field strength and (b) energy density at the center of the loop.

User Cliff Chew
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1 Answer

6 votes

Step-by-step explanation:

It is given that,

Radius of loop, r = 78 mm = 0.078 m

Current, I = 114 A

(a) Magnetic field strength of the circular loop is given by :


B=(\mu_oI)/(2R)


B=(4\pi * 10^(-7)* 114)/(2* 0.078)

B = 0.000918 T

or


B=9.18* 10^(-4)\ T

(b) Energy density at the center of the loop is given by :


U=(B^2)/(2\mu_o)


U=((0.000918)^2)/(2* 4\pi * 10^(-7))


U=0.335\ J/m^3

Hence, this is the required solution.

User Varun Maggo
by
8.2k points

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