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State the rule to determine the direction of force.
The direction of magnetic force acting on a current wire placed in a magnetic field is given by Flemings left hands rule.
According to Flemings Left-hand rule:- If we arrange our left hand's thumb, index finger and middle finger mutually perpendicular to each other. And if we put our index finger in the direction of magnetic field applied and centre finger in direction of electric current then the thumb will point in the direction of the magnetic force.
So, as mentioned magnetic force, magnetic field and electric current all are perpendicular to each other.
Mr. Sharma used to park his car in the basement of his house. One day in the morning he noticed that his basement is full of knee-deep water and its walls were wet because of the hours-long rain at night. When he entered the basement, he experienced a major shock. His father seeing him from outside, rushed to the main switch and switched it off and thus saved his life.
(a) Why Mr. Sharma experienced the shock?
(b) What precautions should Mr. Sharma take to avoid such incidences in future?
(c) Which qualities were shown by Mr. Sharma’s father?