The magnitude of H at a radius of 1 meter from along linear conductor is 1 A/m. The current in the wire is
Given, r = 1 m, H = 1 A/m
Using Ampere’s circuit law, we have:
What is the value of magnetic flux density at the centre of the square current loop shown in figure below?
The magnetic flux density at the centre of the square having each side a is given by
Given, a = 2 m, I = 5 Amp
A solenoid of 20 cm long and 1 cm diameter has a uniform winding of 1000 turns. If the solenoid is placed in a uniform field of 2 Wb/m^{2} flux density and a current of 10 amps, is passed through the solenoid winding, then the maximum torque on the solenoid will be
Given, l = 20 cm = 0.2 m,
r  0.5 cm = radius = 0.005 m
N = 1000,
B = 2 Wb/m^{2},
I = 10 A
The torque acting on the solenoid is
T = NIAB sinθ
T will be maximum when
θ = 90°, i.e. sin90° = 1
∴ T_{max} = 1000 x 10 (0.005 x 0.2) x 2
= 20 Nm
What is the value of magnetic flux density at the centre of a current carrying loop when the loop radius is 2 cm, loop current is 1 mA and the loop is placed in air?
Magnetic flux density at the centre of a current carrying loop is given by
A magnetic field known to be directed in a cartesian coordinate system so that exists in the xdirection where H_{x} = Constant. The value of curl
Curl cartesian coordinate is given by
Since H_{x} = constant and H_{y} = H_{z} = 0, therefore
= 0 + 0 + 0
Match ListI with Listll and select the correct answer using the codes given below the lists:
ListI
A. Faraday’s induction law
B. Maxwell equation in point form
C. Electric field strength general equation
The force acting between two parallel wires carrying currents I_{1} and I_{2} and separated by a distance r is given by
Flux lines are received at an ironair boundary at an angle of 45° from the normal on the iron side of the boundary. If the iron has a relative permeability of 350, then the angle from the normal with which the flux emerges into the air would be
Let medium1 and medium2 are respectively iron and air, then
or
or
The unit of magnetic flux is given by
Assertion (A): The potential in case of magnetic field is a vector potential.
Reason (R): The potential in case of electric field is a scalar potential
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