The standard value of the horizontal component of earth's magnetic field is T. The horizontal component of the magnetic field varies according to the direction of the magnetic field in that particular place. The angle of dip at the equator is the maximum and at the poles is zero.
Velocity of jet plane,v= 450m/s
Length of the jet wing,I= 30 m
Horizontal component of Earth's magnetic field,B=4×10^-4T
Angle of dip,sin=30°
Here,using formula for induced e.m.f we are having induced e.m.f,
▲e=B I v sin
⏩The direction of wing doesn't affect e.m.f.
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angle of dip is 65 degree
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circular coil of radius 10cm ,500turns and resistance 200 ohm is placed with its plane perpendicular to the horizontal component of the earth magnetic field.it is rotated about its vertical diameter through 180 in .25s estimate the magnetic of the emf and current
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⭐Let velocity of plane v = 450 m/s.
wingspan l = 30 m.
mag. Field B = 4 × 10-4 T
angle of dip α = 30∙
✔️therefore vertical component Bv = B sin α
= 4 × 10-4 × sin 30∙
Bv = 2 × 10-4 T
⭐Motional EMF ε = Bv l v
= 2 × 10-4 × 30 × 450
= 27000 × 10-4
ε = 2.7 Volts
First of all we will convert the velocity into m/s as it is provided in km/hr.
It will be 250 m/s
We know that the length of wing is 20 m
and horizontal component is 5×10⁻⁴
and the angle of dip is 30°
E = Blvsin(θ)
E = Blv Sin 30
E = 5*10⁻⁴ * 20*250* sin 30
H = Bcos θ = 0.4 cos 60°
= 0.2 G = 0.2 × 10⁻⁴ T
This component is parallel to the plane of the wheel.
Thus, the emf induced is
ε = 1/2 Bl²ω where, ω = 2πf
ε = 1/2 × 0.2 × 10⁻⁴ × (0.5)² × 2 × 3.14 × 120 / 60∴ ε = 3.14 × 10⁻⁵ V ( FINAL RESULT )GOOD LUCK !!
(b) you have been selected by your school for students exchange program with a school
in frankfurt (germany). under program ten students and two teachers from
your school are going to frankfurt for two weeks. describe your excitement on
being selected in the group, and the preparation to go to germany.
(c) your family had gone on a long vacation. there was a heavy downpour in your
absence. narrate your experience of cleaning the house and repairing the damage
on your return.
(d) express your views either for or against the statement: “a modern has a more
comfortable life at school than parents had when were at school.”
(e) study the picture given below. write a short story or a description or an account of
what it suggests to you. your composition may be about the subject of the picture