Question

# Assertion :Consider two identical charges placed at a distance 2d apart, along the x-axis. The state of equilibrium of a positive test charge placed at the point O midway between them is stable for displacements along the x-axis. Reason: Force on test charge is zero.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
No worries! Weâ€˜ve got your back. Try BYJUâ€˜S free classes today!
B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
C
Assertion is correct but Reason is incorrect
No worries! Weâ€˜ve got your back. Try BYJUâ€˜S free classes today!
D
Both Assertion and Reason are incorrect
No worries! Weâ€˜ve got your back. Try BYJUâ€˜S free classes today!
Open in App
Solution

## The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for AssertionOn displacement along X-axis, the net force on the charge becomes non-zero and is always towards origin O.And hence the force on test charge moves the charge back to O restoring its stabitlity.But when, charge is displaced along Y-axis, net force on it becomes along Y-axis in direction of displacement and not along origin so as to restore its initial position.Hence. the charge is stable for displacement along X-axis.As both charges are equal and equidistant from O, net field at O becomes zero.Hence force on test charge becomes zero.Hence, both Assertion and Reason are correct but Reason is not correct explanation of Assertion.Answer-(B)

Suggest Corrections
0
Join BYJU'S Learning Program
Related Videos
Electric Flux
PHYSICS
Watch in App
Explore more
Join BYJU'S Learning Program