In series LCR circuit, the phase difference between applied voltage and current is
Positive when XL > XC
positive when XC > XL
90o
0o
What is the dimensions of a magnetic field B in terms of C ( = coulomb ), M, L, T?
[ M1 L-1 T-2 C ]
[ M1 L0 T-1 C-1 ]
[ M1 L0 T-2 C ]
[ M1 L0 T-1 C ]
Energy stored in between the plates of parallel plate capacitor of area A, separated by distance d is
ε0 E2 Ad
ε0 E2
ε0
Magnetic energy per unit volume is represented by
A.
The emf induced in an inductor
Iε = I2 R + LI
This expression indicates that the rate at which energy is supplied by the battery (Iε ) equals the sum of the rate at which energy energy delivered to the resistor I2R and the rate at which energy is stored in the inductor
Now U is the energy stored in inductor at any time, rate of change of energy is given by
To find the total energy stored in the inductor, dU = LI
U =
= LI dI
U = L I2 ....(i)
where L is constant.
This expression represents the energy stored in the magnetic field of the inductor when current is I.
The energy stored in the electric field of capacitor
U =
Now energy density of magnetic field
L = μ0n2 Al
The magenetic field of a solenoid is given by
B = μ0 nI
Substituting the expression for L and I =
Put above value in eq. (i)
U =
⇒ U =
Because Al is the volume of the solenoid, the energy stored per unit volume in the magnetic field surrounding the inductor is
uB =
⇒ uB =
Which of the following subsances magnetic susceptibility χm is negative?
Diamagnetic
Paramagnetic
Ferromagnetic
antiferromagnetic
When orientation. of dipoles parallel and antiparallel to magnetic field is distributed unequally, then the material is
paramagnetic
ferromagnetic
ferrimagnetic
antiferromagnetic