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**Home⇒ Engineering⇒ Magnetic circuit and electromagnetism**

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Q1 ⇒ The surface integral of the electrical field intensity is thenet flux emanating from the surface.[other wrong options] [Discuss in forum] electric charge. charge density. flux density. |

Q2 ⇒ Soft magnetic materials havehigh permeability and low coercive force.[other wrong options] [Discuss in forum] low permeability and high coercive force. high residual magnetism. low resistivity. |

Q3 ⇒ ∇B is based onGauss's law.[other wrong options] [Discuss in forum] Lenz's law. Ampere's law. continuity equation. |

Q4 ⇒ The magnetic field intensity (in A/m) at the centre of a circular coil
of diameter 1 m and carrying a current of 2 A is2[other wrong options] [Discuss in forum] 8 4 3 |

Q5 ⇒ A magnetic circuit requires 800 AT to produce a certain quantity
of flux in magnetic circuit. If its excitation coil has 100 turns and
5 ω resistance, the voltage tobe applied in exciting coil is40 V[other wrong options] [Discuss in forum] 60 V 80 V 8 V |

Q6 ⇒ The emf induced in a coil due to relative motion of a magnet is
independent ofcoil resistance.[other wrong options] [Discuss in forum] magnet motion. number of coil turns. pole strength of the magnet. |

Q7 ⇒ The inductance of a long solenoid of length 1,000 mm wound
uniformly with 3000 turns on a cylindrical paper tube of 60 mm
diameter is32 mH[other wrong options] [Discuss in forum] 3.2 µH 3.2 mH 3.2 H |

Q8 ⇒ Two coils are coupled in such a way that the mutual inductance
between them is 16 mH. if the inductances of the coils are 20 mH
and 80 mH respectively, the coefficient of coupling is0.4[other wrong options] [Discuss in forum] 0.01 0.1 0.0025 |

Q9 ⇒ Which of the following inductors will have the least eddy current
losses?air-cored.[other wrong options] [Discuss in forum] iron cored. wooden cored laminated iron cored. |

Q10 ⇒ Core of an electromagnet should haveboth (a) and (b).[other wrong options] [Discuss in forum] low coercivity. high susceptibility. none of these. |

Q11 ⇒ What is the value of total electric flux coming out of a closed
surface?Equal to the total charge enclosed by the surface.[other wrong options] [Discuss in forum] Zero. Equal to volume charge density. Equal to the surface charge density. |

Q12 ⇒ Soft magnetic material isiron.[other wrong options] [Discuss in forum] tungsten steel. Alcomax. bismuth. |

Q13 ⇒ Image theory is applicable to problems involvingelectrostatic field only.[other wrong options] [Discuss in forum] magnetostatic field only. both electrostatic and magnetostatic fields. neither electrostatic nor magnetostatic field. |

Q14 ⇒ The field at any point on the axis ofa current carrying coil will beparallel to the axis.[other wrong options] [Discuss in forum] perpendicular to the axis. at an angle of 45° with the axis. zero. |

Q15 ⇒ Δ x E = dB/dt is derived fromFaraday's law.[other wrong options] [Discuss in forum] Ampere's law. Gauss's law. none of these. |

Q16 ⇒ If a copper conductor is moved across a magnetic fielda voltage will be induced in the wire.[other wrong options] [Discuss in forum] the wire will become magnetic a current will be induced in the wire nothing will happen |

Q17 ⇒ The inductance of a single layer solenoid of 10 turns is 5 µH.
Which one cf the following is the correct value of inductance
when the number of turns is 20 and the length is doubled?10 µH[other wrong options] [Discuss in forum] 20 µH 40 µH 5 µH |

Q18 ⇒ Two identical coils of negligible resistance, when connected in
series across a 50Hz fixed voltage source, draw a current of 10 A.
When the terminals of one of the coils are reversed, the cun'ent
drawn is 8 A. The coefficient of coupling between the two coils is1/9[other wrong options] [Discuss in forum] 1/100 4/10 8/10 |

Q19 ⇒ Magnetostriction is a phenomenon whereby the magnetisation of
a ferromagnetic material leads to a change inphysical dimensions[other wrong options] [Discuss in forum] relative permeability spontaneous magnetisation magnetic susceptibility |

Q20 ⇒ When a battery of E volts is suddenly applied across an ideal
inductance of L henry, the current through inductance will beincreasing linearly at the rate of E/L ampere/s.[other wrong options] [Discuss in forum] zero. infinity instantaneously. none of these |

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