A positively-charged particle (alpha-particle) projected towards the west is deflected towards north by a magnetic field. The direction of magnetic field is 1. towards south 2. towards east 3. downward 4. upward
ScienceClass 10CBSEAnswered 27 Mar 2026
Answer
Solution:
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.
Suggested Q&A
Science · Class 10- ScienceClass 101. Why does a magnetic compass needle pointing North and South in the absence of a nearby magnet get deflected when a bar magnet or a current carrying loop is brought near it. Describe some salient features of magnetic lines of field concept.
- ScienceClass 101. What is the role of fuse, used in series with any electrical appliance? Why should a fuse with defined rating not be replaced by one with a larger rating?
- ScienceClass 10Explain different ways to induce current in a coil.
- ScienceClass 10What is the role of split ring in an electric motor?
- ScienceClass 10What is the principle of an electric motor?
- ScienceClass 10State Fleming’s left-hand rule.
- ScienceClass 10In 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?
- ScienceClass 10Which 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.) 1. Mass 2. Speed 3. Velocity 4. Momentum
- ScienceClass 10Choose the correct option. The magnetic field inside a long straight solenoid-carrying current 1. is zero. 2. decreases as we move towards its end. 3. increases as we move towards its end. 4. is the same at all points.
- ScienceClass 10Why don’t two magnetic field lines intersect each other?