MCQs of Steady Magnetic Fields (Electromagnetics Field - 3140912)

Electromagnetics Field (3140912) MCQs

MCQs of Steady Magnetic Fields

Showing 31 to 40 out of 43 Questions

31.

If the curl of the magnetic field is 2ā_x A/m², the current density is

(a)	2ā_x A/m²
(b)	0.2ā_x A/m²
(c)	1ā_x A/m²
(d)	0.1ā_x A/m²

32.

∫(∇×H)•dS is

(a)	Zero
(b)	I_enc
(c)	J
(d)	∫H•dS

33.

The unit of scalar magnetic potential is

(a)	Ampere
(b)	Volt
(c)	Ampere/m
(d)	Volt/m

34.

∇×∇V_m is

(a)	Zero
(b)	∇²V_m
(c)	J
(d)	∇•∇V_m

35.

∇×A is

(a)	H
(b)	B
(c)	J
(d)	Zero

36.

If the magnetic flux density in a medium is given by B = (CosΦ/ρ)ā_ρ, then flux crossing the surface −π/4<Φ<π/4 and 0≤z≤2 is

(a)	2.83 Wb
(b)	2.83 mWb
(c)	2.83 μwb
(d)	2.83 nWb

37.

What is the magnetic flux density in free space for magnetic field, H = 3ā_x+2ā_y A/m?

(a)	3.7ā_x−2.5ā_y μWb/m²
(b)	−3.7ā_x−2.5ā_y μWb/m²
(c)	3.7ā_x+2.5ā_y μWb/m²
(d)	−3.7ā_x+2.5ā_y μWb/m²

38.

What is the magnetic flux density for a medium with μ_r=3 and H = rSinΦā_r+2.5rSinΘCosΦā_Φ A/m?

(a)	3.14rSinΦā_r+7.85rSinΘCosΦā_{Φ μWb/m²}
(b)	3.14rSinΦā_r+7.85rSinΘCosΦā_{Φ μWb/m²}
(c)	−3.14rSinΦā_r+7.85rSinΘCosΦā_{Φ μWb/m²}
(d)	−3.14rSinΦā_r−7.85rSinΘCosΦā_{Φ μWb/m²}

39.

For a given magnetic flux density, B = ρā_Φ Wb/m², total flux crossing the surface, Φ = π/2, 1≤ρ≤2 m, 0≤z≤5 m is

(a)	75 Wb
(b)	0.75 Wb
(c)	750 Wb
(d)	7.5 Wb

40.

What will be the magnetic flux between the conductors of a coaxial cable of length 10 m?
The radius of the inner conductor is 1 cm and that of the outer conductor is 2 cm. The current enclosed is 2A.

(a)	277 μWb
(b)	0.277 μWb
(c)	27.7 μWb
(d)	2.77 μWb

Showing 31 to 40 out of 43 Questions