MAGNETISM AND CAPACITORS - Practice Mode

1) What is the similar term in magnetic circuit for ?conductance? in electrical circuit?

Reluctivity Permeance Reluctance Permeability

Correct Answer: Permeance

2) What is the unit of Reluctance?

Weber / metre<sup>2</sup> Weber / metre Ampere turns / Weber Ampere turns / metre<sup>2</sup>

Correct Answer: Ampere turns / Weber

Explanation:

Reluctance is magnetomotive force per unit flux,
So unit of reluctance = unit of MMF / unit of magnetic flux = A/Wb. = Ampere turns / Weber

3) Which is the correct expression of capacitance C if the electric charge is Q and the voltage is V?

C = Q/V C = V/Q C = VQ C = Root of (VQ)

Correct Answer: C = Q/V

4) How can you increase the pulling strength of an electromagnet?

Increase the field intensity Reduce the current in the coil Reduce the number of turns in the coil Increase the B-H curve of the material

Correct Answer: Increase the field intensity

5) Which defines the flux density is always lagging behind the magnetising force?

Hysteresis Magnetic intensity Magnetic induction Residual magnetism

Correct Answer: Hysteresis

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