wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

Charges 2q and q are placed at (a,0) and (a,0) as shown in the figure. The coordinates of the point at which electric field intensity is zero is (x,0). Then:


A
x>a
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
a<x<a
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
0<x<a
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
x<a
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
Open in App
Solution

The correct option is D x<a
We know that, electric field due to a point charge is given by,
E=kQr2 [EQ and E1r2]


For point O(a<x<a), direction of electric field due to both charges will be same, so net electric field cannot be zero for a<x<a.

At point A(x>a), direction of electric field due to both charges are in opposite directions.
But, magnitude of electric field due to +2q charge will be greater as magnitude of charge is greater than q and also distance is less than that of q.
Therefore, net electric field cannot be zero for x>a as well.

At point B(x<a), direction of electric field due to both charges are in opposite directions and also magnitude of electric field may become equal as distance is less for charge q, so it may compensate for the effect of smaller value of charge.

Hence, for some point B(x<a), the net electric field will be zero.

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
Join BYJU'S Learning Program
CrossIcon