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1. 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.)
 
When a proton enters the region of magnetic field, it . Due to which the path of the proton becomes . As a result, the properties of a proton change.
 
2. 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 the .
 
According to the rule, if we arrange our thumb, forefinger and the middle finger of the , then the thumb points towards the direction of the , the middle finger the direction of  and the forefinger the direction of .
 
Since the direction of positively charged particle is towards 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 magnetic field will be  according to .