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Magnetism and Matter
Question
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A magnetic field exerts no force on

  • a magnet

  • an unmagnetised iron bar

  • a moving charge

  • stationary charge

Answer

D.

stationary charge

Moving charge can develope magnetic field and also experience the magnetic field. But stationary charge do not have to ability to develope or experience magnetic field from other magnetic fields. Because moving charge gives rise to current which is responsible for the magnetic effects. 

  F = q vB 

 F = 0 when v = 0

i.e., a stationary charge experiences no force in a magnetic field.

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Some More Questions From Magnetism and Matter Chapter

Answer the following question:
The earth's magnetic field varies from point to point in space. Does it also change with time? If so, on what time scale does it change appreciably?

Answer the following question:
The earth's core is known to contain iron. Yet geologists do not regard this as a source of the earth's magnetism. Why?

Answer the following question:
The charged currents in the outer conducting regions of the earth's core are thought to be responsible for earth's magnetism. What might be the ‘battery’ (i.e., the source of energy) to sustain these currents?

Answer the following question:
The earth may have even reversed the direction of its field several times during its history of 4 to 5 billion years. How can geologists know about the earth's field in such distant past?

Answer the following question:
The earth’s field departs from its dipole shape substantially at large distances (greater than about 30,000 km). What agencies may be responsible for this distortion?