A magnetic dipole made from a i = 9.8 micro-Ampere current loop with an enclosed

Question

A magnetic dipole made from a i = 9.8 micro-Ampere current loop with an enclosed area A = 0.09 cm^2 is bounded by a spherical Gaussian surface surrounding the entire loop. What is the net flux of the magnetic field of this dipole through the Gaussian surface? Select one: 1.23e-11 Weber 8.82e-11 Weber 9.80e9 Weber Weber, there is no net flux through the surface A capacitor with circular plates with radius 0.071 meters has a net displacement current of 0.0042 Amps between its plates at a given instant of time. How fast is the electric field rising in V/m per second in the capacitor? Assume a uniform electric field between the plates with no fringing at the plate edges. Select one: 2.1 e5 V/m per second 1.1e9 V/m per second 0 V/m per second since a changing electric field cannot produce a current in the gap between capacitor plates 9.4e10 V/m per second 29966737044.98 V/m per second

Explanation / Answer

The flux passing through a surface enclosing a dipole is zero.
It is so because the net charge is null [ equal number of positive and negative charges nullify each other ].
Hence no flux will pass.

E = Q/A0

E/t = Q/At0 = I/A0 = 0.0042 / [pi*(0.071)^2 * 8.854 × 10^-12] = 29966737044.98 V/m

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