1
GATE EE 2017 Set 1
Numerical
+2
-0
The magnitude of magnetic flux density (B) in micro Teslas ( µT ) at the center of a loop of wire wound as a regular hexagon of side length 1 m carrying a current (I = 1A), and placed in vacuum as shown in the figure is __________.
2
GATE EE 2014 Set 1
+2
-0.6
The following four vector fields are given in cartesian coordinate system. The vector field which does not satisfy the property of magnetic flux density is
A
$$y^2{\widehat a}_x\;+\;z^2{\widehat a}_y\;+\;x^2{\widehat a}_z$$
B
$$z^2{\widehat a}_x\;+\;x^2{\widehat a}_y\;+\;y^2{\widehat a}_z$$
C
$$x^2{\widehat a}_x\;+\;y^2{\widehat a}_y\;+\;z^2{\widehat a}_z$$
D
$$y^2z^2{\widehat a}_x\;+\;x^2z^2{\widehat a}_y\;+\;x^2y^2{\widehat a}_z$$
3
GATE EE 2014 Set 2
+2
-0.6
The magnitude of magnetic flux density ($$\overrightarrow B$$) at a point having normal distance d meters from an infinitely extended wire carrying current of I A is $$\frac{\mu_0I}{2\mathrm{πd}}$$ (in SI units). An infinitely extended wire is laid along the x-axis and is carrying current of 4 A in the +ve x direction. Another infinitely extended wire is laid along the y-axis and is carrying 2 A current in the +ve y direction. μ0 is permeability of free space. Assume $$\widehat i,\;\widehat j,\;\widehat k$$ to be unit vectors along x, y and z axes respectively. Assuming right handed coordinate system, magnetic field intensity, $$\overrightarrow H$$ at coordinate (2,1,0) will be
A
$$\frac3{2\mathrm\pi}\widehat k\;$$ Weber/m2
B
$$\frac4{3\mathrm\pi}\widehat i\;A/m$$
C
$$\frac3{2\mathrm\pi}\widehat k\;A/m$$
D
0 A/m
4
GATE EE 2008
+2
-0.6
A coil of 300 turns is wound on a non-magnetic core having a mean circumference of 300 mm and a cross-sectional area of 300 mm2. The inductance the coil corresponding to a magnetizing current of 3 A will be ( Given that $$\mu_0=4\mathrm\pi\times10^{-7}\;\mathrm H/\mathrm m$$)
A
37.6 µH
B
113.04 µH
C
37.68 mH
D
113.04 mH
EXAM MAP
Medical
NEET