physics : class12 Direction of Resultant Electric Field : Superposition Principle : Electrostatics MCQ Questions and Answers
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Direction of Resultant Electric Field
MCQ questions and answers.
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MCQ Questions
1. Two electric fields at a point have magnitudes 5 N/C and 3 N/C, and both point east. What is the direction of the resultant electric field?
A.
East
B.
West
C.
North
D.
South
Correct Answer:
East
Explanation:
Electric fields in the same direction add together, so the resultant field points east.
2. At a point, two electric fields of 8 N/C east and 3 N/C west act simultaneously. What is the direction of the resultant electric field?
A.
East
B.
West
C.
North
D.
There is no resultant field
Correct Answer:
East
Explanation:
The fields are opposite, and the larger field is eastward. Therefore, the resultant points east.
3. Two equal electric fields act at a point in exactly opposite directions. What can be said about the direction of the resultant electric field?
A.
It points in the direction of either field
B.
It points perpendicular to both fields
C.
It has no definite direction because its magnitude is zero
D.
It points in the direction of the larger field
Correct Answer:
It has no definite direction because its magnitude is zero
Explanation:
Equal and opposite electric fields cancel completely, giving zero resultant field, which has no definite direction.
4. Two mutually perpendicular electric fields have equal magnitudes. In which direction does their resultant field point relative to either field?
A.
Along either one of the fields
B.
At 45° to either field
C.
At 90° to both fields
D.
Opposite to both fields
Correct Answer:
At 45° to either field
Explanation:
Equal perpendicular vectors have equal components, so their resultant bisects the angle between them at 45°.
5. An electric field of 4 N/C acts east and another field of 4 N/C acts north at the same point. What is the direction of the resultant field?
A.
North-east
B.
South-east
C.
North-west
D.
South-west
Correct Answer:
North-east
Explanation:
The resultant of equal eastward and northward fields points diagonally between them, toward the north-east.
6. Two identical positive point charges are placed symmetrically on either side of a point located midway between them. What is the direction of the resultant electric field at the midpoint?
A.
Toward the left charge
B.
Toward the right charge
C.
Along the line joining the charges
D.
It has no definite direction because the resultant field is zero
Correct Answer:
It has no definite direction because the resultant field is zero
Explanation:
The two fields at the midpoint have equal magnitudes and opposite directions, so they cancel and the resultant has no definite direction.
7. Two equal positive charges are placed symmetrically on a horizontal line. At a point directly above their midpoint, in which direction does the resultant electric field point?
A.
Upward
B.
Downward
C.
Horizontally toward the left
D.
Horizontally toward the right
Correct Answer:
Upward
Explanation:
The horizontal components of the two fields cancel, while their upward components add, so the resultant points upward.
8. A positive and a negative charge of equal magnitude are placed apart. At the midpoint between them, what is the direction of the resultant electric field?
A.
From the negative charge toward the positive charge
B.
From the positive charge toward the negative charge
C.
Perpendicular to the line joining the charges
D.
The resultant has no direction
Correct Answer:
From the positive charge toward the negative charge
Explanation:
At the midpoint, the field due to the positive charge points away from it and the field due to the negative charge points toward it; both point from positive to negative.
9. Two electric fields of equal magnitude act at an angle of 60° to each other. In which direction does their resultant point?
A.
Along the direction of either field
B.
Along the angle bisector between the two fields
C.
Perpendicular to the angle bisector
D.
Opposite to the angle bisector
Correct Answer:
Along the angle bisector between the two fields
Explanation:
For two equal vectors, the resultant lies along the bisector of the angle between them.
10. At a point, an electric field of 6 N/C acts upward and a field of 2 N/C acts downward. What is the direction of the resultant field?
A.
Upward
B.
Downward
C.
Horizontal
D.
The resultant has no definite direction
Correct Answer:
Upward
Explanation:
The fields are opposite, but the upward field is larger, so the resultant field points upward.
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Direction of Resultant Electric Field
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