Chapter-13 :-magnetic effect of electrical current
activity 13.6 conclusion
CLASS - X
{NCERT}
Answers
Answer:
Brief Procedure: Activity 13.4 asks us to change the direction of current in a wire and see the deflection in the compass.
Activity Solution 13.4 Class 10 Science
Compass also changes its direction with change in direction of current in a nearby wire.
Observation: When we reverse the direction of the current, compass needle also reverses its direction.
If current flows from north to south, the direction of the needle is east; similarly, if the direction of current is reversed the direction of compass point towards west.
Explanation:
When we pass current into a wire, it produces a magnetic field. This field is perpendicular to the direction of the current. So, if current flows from north to south, east becomes the north pole of the magnetic field. In such a situation the south pole of magnet aligns with the north pole and see compass directing towards the east.
Similarly, if we change the direction of the current by changing the terminals of the battery, the direction of current reverses. This results in the production of a magnetic field in the opposite direction. As a result, the compass also reverses its direction.
Conclusion: Magnetic filed is a vector quantity.
Note: We can use Right thumb rule to find the direction: Palm on the plane and movement of fingers in the direction of the current gives thumb as North pole.