Force on a current carrying conductor in a magnetic field

Q.1    Give the statement for Fleming’s left hand rule.

Ans.   Fleming’s left hand rule : Stretch the forefinger, the central finger & the thumb of   your left hand mutually perpendicular to each other. It the forefinger shows the direction of the field & the central finger shows the direction of the current, then the thumb will point towards the direction of the motion of the conductor.

Fig. Showing Fleming’s left hand rule.

Q. 2     How magnetism is used in medical sciences ? Explain in brief.

Ans. i)   Electric current produces magnetic field, even if the current is very weak.

ii)       An ion current travels along the nerve cells in our body produces magnetic fields.

iii)      Thus current is very weak, hence magnetic field produced is also weak.

iv)      When we touch an object, the nerves in our body carry an electrical impulse to the muscles to be used.

v)      This impulse produces a very weak magnetic field for a short duration. This field is only about 10^-9  times the earth’s magnetic field.

vi)       Heart & brain are the two main organs where significant fields are produced.

vii)    This forms the basis of obtaining images of heart & brain or images of different body parts.

viii)    This is done by using magnetic Resonance Imaging (MRI) technique. Analysis of these images useful in medical diagnosis.

Q. 3     What is ‘MRI’ ? Where it is used ?

Ans.     ‘MRI’ stands for magnetic Resonance Imaging. An ion current is a weak current travelling along the nerve cells in our body. The electrical impulses carried by our nerves produces a weak magnetic field, especially in the heart & brain. This helps in obtaining images of heart, brain & other organs. Analysis of these images helps in the diagnosis of disorders.

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