Bissoy.com
Doctors Medicines MCQs Q&A

A small object carrying a charge -5 × 10-9 Coulomb experiences a downward force of 20 × 10-9 Newton when placed at a certain point in an electric field. The electric field intensity at the point is

A small object carrying a charge -5 × 10-9 Coulomb experiences a downward force of 20 × 10-9 Newton when placed at a certain point in an electric field. The electric field intensity at the point is Correct Answer 4 Newton/Coulomb upward

CONCEPT:

  • Electric field force: When a charge moves in an electric field, a force will act on it, that is known as electric field force.
    • Due to the electric field, Force is always in the direction of the electric field if the charge is positive.

F = qE

where F is the force due to the electric field, q is the charge, and E is the electric field.

CALCULATION:

Given that q = -5 × 10-9 Coulomb and F = 20 × 10-9 Newton

F = qE

20 × 10-9 = -5 × 10-9 × E

E = 4 Newton/Coulomb

  • Since the charge is negative so the direction of the electric field will be opposite to the direction of Force (downward).

E = 4 Newton/Coulomb upward.

So the correct answer will be option 3.

Related Questions

Which of the following is/are true about dipole? (1) The unit of electric dipole moment is coulomb meter (2) The net charge of the electric dipole is zero (3) The net electric field due to an electric dipole is nonzero. (4) Point diploe is the diploe with a small value of the charge.
During a class experiment, a teacher took two objects and immersed them in water. She recorded the readings using a spring balance as shown below: Object Wt. of Stone in Air (Newton) Wt. of Stone in Water (Newton) Weight of Liquid Displaced (Newton) Buoyant Force acting on body (Newton)  A 92 X 16 Y B Q 70 Z 10 Which of the following is correct?
How far is point 'R' from Point 'T'? Statement (I): Point 'R' is 5 metres to the north of point 'M'. Point 'U' is 4 metres to the east of point 'R'. Point 'T' is to the west of point 'R' such that points 'U' 'R' and 'T' form a straight line of  metres. Statement (II): Point 'Z' is metres to the south of point 'T'. Point 'U' is  metres to the east of point 'T'. Point 'M' is  metres to the east of point 'Z'. Point 'R' is  metres to the north of point 'M'. Point 'R' lies on the line formed by joining points 'T' and 'U'.
Assertion (A) The coulomb force is the dominating force in the universe.
Reason (R) The Coulomb force is stronger than the gravitational force.
Point A is 3m in the north of point B. Point D is 2m in the east of point E. Point F is 9m in the west of point G. Point C is 4m in the west of point B. Point C is 3m in the south of point D. Point F is 5m in the south of point E. Point H is 5m in the north of point G. What is the shortest distance between point H and point A?
A force \(\vec F\), acting on a electric charge q, in presence of electro-magnetic field, moves the charge parallel to the magnetic field with velocity \(\vec v\). Then \(\vec F\) is equal to (where \(\vec E\)and \(\vec B\) are electric field and magnetic field respectively)
Point P is 4m in the west of point V. Point R is 6m in the north of point Q. Point T is 5m in the south of point S. Point V is in the middle of point R and Q. Point U is 5m in the east of point R. Point V is in north of point Q. Point S is 5m in the east of point V. What is the area of triangle formed by point P, R and Q?
The electric field strength at a far-off point P due to a point charge, +q located at the origin O is 100 milliVolt/meter. The point charge is now enclosed by a perfectly conducting hollow metal sphere with its centre and the origin O. The electric field strength at the point, P is
Newton, Einstein, and Tesla working alone can do a piece of work in 20, 30, and 60 days respectively. All three of them start the work together, but after x days Newton leaves and then after y more days Einstein leaves and Tesla completes the remaining work. If Einstein had not left, Tesla and Einstein would have completed the remaining work in (y + 6) days after Newton had left. If both Newton and Einstein had stayed, the work would have been completed in (x + 6) days. What is the total number of days taken to complete the work?
The electric field intensity at a point situated 4 meters from a point charge is 200 N/C. If the distance is reduced to 2 meters, the field intensity will be