### Magnetostatics Objectives Part 01

**01 . ** Unit of relative permeability is** it is dimensionless**

**02 .** A magnetic pole is** that pole which when placed in vacuum at a distance of one meter form a similar and equal pole repels it with a force of 1/4πμo newtons**

**03 .** Which of the following is a vector quantity: **Magnetic field Intensity**

**04 . ** The ratio of intensity of magnetization to the magnetizing force is known as** susceptibility**

**05 .** Unit of susceptibility is** Henry/meter**

* 06 .* A conductor of length L has current I passing through it, which when placed parallel to a strong magnetic field. The force experienced by the conductor will be

**Zero**

**07 . ** A wire 2.5m long is bent into a square. A current of 100A flowing through the wire will produce a magnetizing force at the center of the square equal to **144AT/m**

**08 .** In case the wire in above problem is bent in the form of a circle, for the same current of the coil will **same as 144AT/m**

**09 . ** Two infinitely long parallel conductor in vacuum are separated 1m between centers, when a current of 1 ampere flows through each conductor, produce on each other a force of **2×10-7 N per meter length**

**10 .** If the circle and square have the same area, the magnetizing force at the center of the coil, as a result of current flowing through the coil, will be in the ratio **(𝜋32)1/3**

**11 . ** If the bar magnet is bent at its center to form the shape of L, the magnetic moment of the bent magnet will be** 1/√2 times the original**

**12 .** Two straight parallel conductors carry equal currents in opposite directions. The force between them is** repulsive**

**13 .** A property of a material which opposes the creation of magnetic flux in it is known as** reluctance**

**14 .** The unit of reluctance is **Henry-1**

**15 .** Reciprocal of reluctance is** permeance**

**16 .** Whenever a conductor cuts magnetic flux, an e.m.f. is induced in that conductor. Above statement is due to **Faraday’s law**

**17 .** A coil of 100ohm is placed in a magnetic field of 1m Wb. The coil has 100 turns and a galvanometer of 400 ohms resistance is connected in series with it. If the coil is moved in 1/10th second from the given field to 0.2mWb, average emf will be **0.4V**

**18 . ** In the above problem current induced will be **1.6mA**

**19 . ** A conductor of length 100cm moves at right angles to a uniform field flux density of 1.5 Wb/cm2 with a velocity of 50 m/s. The emf induced in the conductor will be** 75V**

**20 . ** In the above problem the induced emf will be reduced to half if the conductor moves at an angle of 30o to the direction of the field.