SSC JE Electrical Engineering 25th Jan 2018 Shift-2

Which one of the following statement is NOT true about the magnetic lines of force?

The relative permeability of paramagnetic material is .........

The SI unit of magnetic flux density is ...........

Which one of the following is the formula of Intensity of magnetization?

What will be the coefficient of self-induction (in H) of the coil, if the current changes from +4 A to -4 A in 0.10-seconds and the induced EMF is 16 V?

Calculate the intensity of magnetization (in $$A-m^{-1}$$) in a material, if the magnetic field strength of the material is 1800 $$Amp - m^{-1}$$ and the magnetic susceptibility is $$0.4 \times 10^{-5}$$.

What will be the produced mmf (in Amp-turns) in a magnetic circuit, if it has 100 number of turns and carrying a current of 0.2 A?

Determine the critical current (in A) for a wire of a material that has a diameter of 2 mm at 8 K. If the critical temperature for the material is 12 K and the magnetic field is
$$6 \times 10^4 Am^{-1}$$

What will be the flux density (in T} of a material in free space, if the field strength of the material is $$2 \times 10^5 A-m^{-1}$$ and the magnetic susceptibility of the material is $$0.44 \times 10^{-3}$$?

Determine the value of time (in sec) when an average EMF of 100 V is induced in a coil of area 200 cm$$^2$$ with 100 turns, when it is completely removed from a magnetic field of 30 T acting at right angles to the coil.