LIVE Course for free

Rated by 1 million+ students
Get app now
+1 vote
in Physics by (59.0k points)
recategorized by

A compass needle is placed near a current-carrying wire. State your observation for the following cases, and give reason for the same in each case. 

(a) Magnitude of electric current in the wire is increased. 

(b) The compass needle is displaced away from the wire.

1 Answer

+2 votes
by (66.7k points)
edited by
Best answer

(a) Observation: The deflection of the needle increases. 

Reason: Magnetic field strength due to current-carrying wire increases as current in the wire increases, B ∝ l.

(b) Observation: The deflection in the compass needle decreases as its displacement from the current-carrying wire increases. 

Reason: The strength of magnetic field reduces with the increase in distance from the wire as B ∝ l/r.

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.