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Practice each question, then open the answer or worked solution.
Which of the following property of a proton can change while it moves freely in a magnetic field? (There may be more than one correct answer.)
(c) and (d)
When a proton enters the region of a magnetic field, it experiences a magnetic force. Due to this, the path of the proton becomes circular. As a result, the velocity and the momentum change.
In Activity 13.7, how do we think the displacement of rod AB will be affected if (i) current in rod AB is increased; (ii) a stronger horse-shoe magnet is used; and (iii) length of the rod AB is increased?
A current-carrying conductor, when placed in a magnetic field, experiences force. The magnitude of this force will increase with the increase in the amount of current, the length of the conductor and the strength of the magnetic field. Hence, the strength of the magnetic force exerted on the rod AB and its displacement will increase if
A positively-charged particle (alpha-particle) projected towards the west is deflected towards north by a magnetic field. The direction of magnetic field is
The direction of the magnetic field can be determined using Fleming’s Left-hand rule. According to the rule, if we arrange our thumb, forefinger and the middle finger of the left hand right perpendicular to each other, then the thumb points towards the direction of the magnetic force, the middle finger the direction of current and the forefinger the direction of magnetic field. Since the direction of the positively charged particle is towards the west, the direction of the current will also be towards the west. The direction of the magnetic force is towards the north. Hence the direction of the magnetic field will be upward according to Fleming’s Left-hand rule.