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[Guneet08]

From gate forum booklet set no 9 I have doubts in these ques .Please explain these
Page number 41 Level 1 Q 3
Page number 44 Level 1 Q 29
Page number 47 Level 2 Q 20
Page number 49 Level 2 Q 33
Page number 73 Level 2 Q 25

[smitpanchal]

If u tell me the ques, i will try to reply..

[Guneet08]

Q)steady mag field 1000A/m is incident on the surface from iron to air at 45°.Takeµr for iron =200.Find angle of refraction?



The potential difference b/w A&B is V volt ,width b/w A and B is d medium εr . Find polarization
a)Vεr/d
b)Vεo/d
c) Vεrεo/d
d) Vεo(εr-1)/d



Q) if E=4Ux-3Uy+5Uz at the pt. (6,2,-3) , then the work done in moving 5C charge a distance of 2 m in the direction of Ux+Uy+Uz is?

Current density(J) , in cylindrical co-ordinate system is given as
J(r,ѳ,z)=0 for 0<r<a
=Jo(r/a^2) Iz for a<r<b, where Iz is unit vector along z co-ordinate axis. In the region a<r<b , what is expression for the magnitude of magnetic field intensity factor(H)?
a) Jo(r^2-a^2)/r^2
b) Jo(r^3+a^3)/r^2
c) Jo(r^3-a^3)/3a^2r
d) Jo(r^3-a^3)/2ᴨr

the energy stored in magnetic field of solenoid 30 cm long and 3 cm diameter wound with 100 turns carrying a current of 10A?
a) 0.015J
b)0.15 J

A circular ring carrying a uniformly distributed charge Q and a pt. charge –Q on the axis of the ring at a distance d from the centre. Magnitude of dipole moment is a) Qd b)QR^2/d c) Q(R^2+d^2)^1/2 d) QR

[smitpanchal]

Energy of a solenoid, E = 1/2(LI^2)
Where, L = (N^2*Uo*A)/l
A = (3.14/4)d^2

Ans is 0.015J.