# Puja's aunt was advised by her doctor to have an ECG (Electrocardiograph)for heart

Puja’s aunt was advised by her doctor to have an ECG (Electrocardiograph)for heart. Her aunt did not know much about the details and significance of this test. She also felt that it was too expensive and thought of postponing it. When Puja learnt about her aunt problem she took the help of her parents, friends and responsible neighbours and arranged for the cost of test. Then she told her aunt that an ECG of her heart would enable the doctor to know the condition of her heart without causing any harm to her. Her aunt was convinced and got the required ECG of her heart done. The resulting information greatly helped her doctors to treat her well.
(a) What according to you, are the values displayed by Puja and her parents, friendsImd neighbours to help her aunt ?
(b) A plane electromagnetic wave of frequency 25 MHz travels in free space along the x-direction. At a particular point space and time, the electric vector \$\overrightarrow{E}\$=6.3 V/m Calculate B at this point.

(a) The values displayed are :
(i) presence of mind,
(ii) high degree of general awareness,
(iii) concern for her aunt, and
(iv) helping and caring nature.
(b) In the given condition, the magnetic vector \overrightarrow{B} must