17. Intext question VI

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 experiences magnetic forcedoes not experience magnetic force. Due to which the path of the proton becomes straightercircularopposite. 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 Right-hand thumb ruleFleming’s Right-hand ruleFleming’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 otherright-hand right perpendicular to each other, then the thumb points towards the direction of the currentmagnetic forcemagnetic field, the middle finger the direction of magnetic fieldcurrentmagnetic force and the forefinger the direction of magnetic fieldcurrentmagnetic force.

 

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 towards southupwarddownwardtowards east according to Fleming’s Right-hand ruleFleming’s Left-hand ruleRight-hand thumb rule.