Willer Academy - Magnetism Quiz

1What is the surest test to confirm if a rod is magnetized?

It attracts an iron rodIt is repelled by another magnet with a strong forceIt aligns itself in the North-South directionIt attracts the opposite pole of another magnet

2According to the tip about a current loop, if the current is anti-clockwise when you look at one side, that side behaves like a:

Magnetic South PoleGeographic North PoleMagnetic North PoleNon-magnetic material

3The direction of a magnet's dipole moment is from:

North pole to South poleSouth pole to North poleGeographic North to Geographic SouthIt has no specific direction

4Coulomb's Law in Magnetism states that the force between two poles is:

Inversely proportional to the distance between themInversely proportional to the square of the distance between themDirectly proportional to the distance between themIndependent of the distance between them

5The SI unit of pole strength is:

Tesla (T)Weber (Wb)Ampere-meter (A.m)Gauss (G)

6The magnetic field inside a long straight current carrying solenoid is:

ZeroUniformNon-uniformVariable

7The earth’s magnetic field is believed to be caused by:

Magnetic materials in earth’s coreElectric currents in earth’s coreGravitational forcesCosmic rays

8Magnetic lines of force:

Intersect each otherDo not intersect each otherAre always straightSometimes form circles

9The material used to make permanent magnets is:

Soft ironSteelCopperNickel

10Which of the following is not a property of magnetic field lines?

They never cross each otherThey always form closed loopsTheir direction is from S to N outside the magnetThey are crowded where the field is strong

11Magnetic permeability is maximum for:

AirWaterVacuumFerromagnetic substances

12The angle of dip at the magnetic equator is:

0°45°90°180°

13The SI unit of magnetic flux is:

Ampere (A)Weber (Wb)Tesla (T)Henry (H)

14The relative permeability of a diamagnetic material is:

Greater than 1Equal to 1Less than 1Infinity

15SI unit of magnetic field intensity is:

A/mT/mGaussHenry

16If a bar magnet is cut into two halves, each piece will have:

Only north poleOnly south poleBoth north and south polesNo poles

17A magnetic material loses its magnetism at:

Room temperatureCurie temperatureAny high temperatureAbsolute zero

18The unit of magnetic susceptibility is:

TeslaDimensionlessA/mGauss

19Magnetic field due to a straight current-carrying conductor at distance r is proportional to:

r1/r1/r²r²

20The Earth's magnetic field is weakest at:

PolesEquatorBoth poles and equatorAll points are same