Q. A one metre long wire is lying at right angles to the magnetic field. A force of $1\ kg\ wt.$ is acting on it in a magnetic field of $0.98\ tesla$. The current flowing in it will be
A) 100 $A$
B) 10 $A$
C) 1 $A$
D) Zero
Explanation
(b) $F = Bil \Rightarrow 1 \times 9.8 = 0.98 \times i \times 1 \Rightarrow i = 10\ A$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.