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Question
Physics
Electric potential at any point is V = - 5x + 3y + √ 15 z, then the magnitude of the electric field is
Q. Electric potential at any point is
V
=
−
5
x
+
3
y
+
15
z
,
then the magnitude of the electric field is
2349
203
BITSAT
BITSAT 2018
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A
3
2
10%
B
4
2
22%
C
5
2
10%
D
7
57%
Solution:
E
x
=
−
r
x
r
v
=
r
x
−
r
(
−
5
x
+
5
y
+
15
z
)
=
5
E
y
=
ry
r
v
=
−
3
E
z
=
−
15
Now,
E
=
E
y
x
+
E
y
z
+
E
z
z
=
7