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WorksheetsElectromagnetic theory
Total questions: 12
Worksheet time: 6mins
Skin depth is
a skin infection at a depth
a skin etching
loss of electromagnetic waves in free space
Exponential decay of electromagnetic signal in a medium
Maxwell's 4th equation in charge free steady current free space suggests
Magnetic field can be produced even if no current element is present due to spacial variation in electric field
Electric field can be produced even if no current element is there
Time variation of electric field can produce magnetic field even if no current density is there
Time variation of magnetic field can produce electric field even if no charge density is there
Speed electromagnetic wave in a medium is
sqrt(mu0*epsilon0)
1/sqrt(mu0*epsilon0)
1/sqrt(mu*esilon)
sqrt(mu*esilon)
A rectangular loop of sides 0.08 m and 0.02 cm having a resistance 1.6 ohm is placed in a magnetic field of 0.3 T directed normal to the loop. The magnetic field is gradually reduced to 0.02 T/sec. Then induced current using the formula e=-dphi/dt. I=e/R and phi=area*magnetic field is
e= 3.2×10-5 V, I=2 x 10-5 A
e= 3.2×10-1 V, I=2 x 10-1 A
e= 3.2 V, I=2 A
e=2 x 10-4 V and I= 3.2 x10-4 A
A metal bar slides without friction on two parallel conducting rails at distance l apart. A resistor R is connected across the rails and a uniform magnetic field B, pointing into this plane fils the entire region. If the bar moves to the right at a constant speed v then the current through the resistor using the formula e=-dphi/dt, phi= Area * magnetic field, i=e/R
e= B dA/dt, i=Blv/R
e= A dB/dt, i=Blx/R
e= -B dA/dt, i= Blv/R
|e|= B dA/dt, i= Blv/R
If E and B of an electromagnetic wave travelling through a free space is of propagation vector k then
k.E=0
k x E =0
B x E =0
k x E = --B
The magnetic flux linked with a coil at any instant t is given by phi= 5t3 -100 t + 200, the emf induced in the colil at t=2 sec
200 V
40 V
20 V
-20V
If mu= 1.732 then determine angle of polarization
30
60
90
infinity
In Nicol Prism has canada balsum layer
to eliminate O-ray
to eliminate e-ray
to eliminate o and e ray both
to reduce headache
Double refraction takes place in
anisotropic crystal only
isotropic crystal only
in any crystal
all types of crystal
E ray
obeys laws of refraction and is in the plane of the crystal
does not obey laws of refraction and is in the plane of the crystal
does not obey laws of refraction and is perpendicular the plane of the crystal
obeys laws of refraction and is perpendicular the plane of the crystal
Polarization converts
unpolarized light to polarized light
polarized light to polarized light
polarized light to unpolarized light
E-ray to O-ray
