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 Multiple Choice QuestionsMultiple Choice Questions

1.

The magnetic susceptibility is negative for,

  • a paramagnetic material only

  • ferromagnetic material only

  • paramagnetic and ferromagnetic materials

  • paramagnetic and ferromagnetic materials

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2.

A wire carrying current I has the shape as shown in the adjoining figure. Linear parts of the wire are very long and parallel to X  -axis while semicircular portion of radius R is lying in a Y-Z plane. The magnetic field at point  O is.

  • bold B space equals space fraction numerator straight mu subscript straight o over denominator 4 straight pi end fraction straight l over straight R space left parenthesis straight pi stack space straight i with hat on top space plus 2 straight k with hat on top right parenthesis
  • bold B space equals space minus fraction numerator straight mu subscript straight o over denominator 4 straight pi end fraction straight l over straight R space left parenthesis straight pi stack space straight i with hat on top space minus 2 straight k with hat on top right parenthesis
  • bold B space equals negative space fraction numerator straight mu subscript straight o over denominator 4 straight pi end fraction straight l over straight R space left parenthesis straight pi stack space straight i with hat on top space plus 2 straight k with hat on top right parenthesis
  • bold B space equals negative space fraction numerator straight mu subscript straight o over denominator 4 straight pi end fraction straight l over straight R space left parenthesis straight pi stack space straight i with hat on top space plus 2 straight k with hat on top right parenthesis
2958 Views

3.

A compass needle which is allowed to move in a horizontal plane is taken to a geomagnetic pole. it

  • will become rigid showing no movement

  • will stay in any position

  • will stay in the north-south direction only

  • will stay in the north-south direction only

609 Views

4.

Following figures show the arrangement of bar magnets in different configurations. Each magnet has magnetic dipole moments m. Which configuration has highest net magnetic dipole moment? 

1116 Views

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5.

Two identical long conducting wire AOB and COD are placed at right angle to each other, with one above other such that O is their common point for the two. The wires carry I1 and I2 currents, respectively. point P is lying at distance d from O along a direction perpendicular to the plane containing the wires. The magnetic field at the point P will be,

  • fraction numerator straight mu subscript straight o over denominator 2 πd end fraction open parentheses I subscript 1 over I subscript 2 close parentheses
  • fraction numerator straight mu subscript straight o over denominator 2 πd end fraction left parenthesis I subscript 1 space plus space I subscript 2 right parenthesis
  • fraction numerator straight mu subscript straight o over denominator 2 πd end fraction space left parenthesis I subscript 1 squared space minus space I subscript 2 squared right parenthesis
  • fraction numerator straight mu subscript straight o over denominator 2 πd end fraction space left parenthesis I subscript 1 squared space minus space I subscript 2 squared right parenthesis
1825 Views

6.

A bar magnet of length l and magnetic dipole moment M is bent in the form of an arc as shown in figure, The new magnetic dipole moment will be

  • M

  • 3M/π

  • 2M/π

  • 2M/π

3733 Views

7.

There are four light -weight rod samples A, B, C D separately suspended by threads. A bar magnet is slowly brought near each sample and the following observations are noted

(i)  A is feebly repelled

(ii) B is feebly attracted

(iii) C is strongly attracted

(iv) D remains unaffected

  • C is a diamagnetic material

  • D is of a ferromagnetic material

  • A is of a non- magnetic material

  • A is of a non- magnetic material

347 Views

8.

A thin ring of radius R metre has charge q column uniformly spread on it. The ring rotates about its axis with a constant frequency of  f revolution/s. The value of magnetic induction in Wb m-2 at the centre of the ring is

  • μoq f/ 2π R

  • μoq / f 2π R

  • μoq / 2 f R

  • μoq / 2 f R

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9.

Electromagnets are made of soft iron because soft iron has

  • low retenitivity and high coercive force

  • high retentivity and high coercive force

  • low retentivity and low coercive force

  • low retentivity and low coercive force

998 Views

10.

A vibration magnetometer placed in magnetic meridian has a small bar magnet. The magnet executes oscillations with a time period of 2s in earth's horizontal magnetic field of 24 μT. When a horizontal field of 18 μT is produced opposite to the earth's field by placing a current-carrying wire, the new time period of magnet will be

  • 1s

  • 2s

  • 3s

  • 3s

598 Views

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