Use app×
Join Bloom Tuition
One on One Online Tuition
JEE MAIN 2025 Foundation Course
NEET 2025 Foundation Course
CLASS 12 FOUNDATION COURSE
CLASS 10 FOUNDATION COURSE
CLASS 9 FOUNDATION COURSE
CLASS 8 FOUNDATION COURSE
0 votes
1.8k views
in Physics by (69.9k points)

Diagram shows a rectangular coil ABCD, suspended freely between the concave pole pieces of a permanent horse shoe magnet, such that the plane of coil is parallel to magnetic field.

(i) State your observation, when current is switched on. 

(ii) Give an explanation for your observation in (i). 

(iii) State the rule, which will help you to find the motion of rotation of coil. 

(iv) In which position will the coil ultimately come to rest? 

(v) State four ways of increasing the magnitude of force acting on the coil. 

1 Answer

+1 vote
by (72.7k points)
selected by
 
Best answer

(i) The coil ABCD will turn. The arm AB of the coil will move out of the plane of paper and arm CD into the plane of paper. Thus, coil will turn in anticlockwise direction. 

(ii) A magnetic field is set up by the coil due to the passage of electric current. The magnetic field of the coil is at right angles to the magnetic field of permanent magnet. Thus, a magnetic couple acts, which turns the coil. 

(iii) Fleming’s left rule: It states : Stretch the thumb, the forefinger and the middle finger of left hand, such that forefinger points in the direction of magnetic field; middle finger points in the direction of current. Then, the thumb points in the direction of motion of conductor. 

(iv) The coil will come to rest at right angles to the direction of magnetic field. 

(v) (a) By increasing the number of turns in coil. 

(b) By increasing the area of cross-section of coil. 

(c) By placing laminated soft iron core within the coil. 

(d) By increasing the magnitude of current coil.

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.

Categories

...