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Two-point charges repel each other with a force of $100 N$ . One of the charges is increased by $10 %$ and the other is reduced by $10 %$ . The new force of repulsion at the same distance would be

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Important Questions on Coulomb's Law and Electric Field

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JEE Advanced

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PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 1 - Coulomb's Law and Electric Field>Exercise>Q 9

Three equal charges, each

+ q

is placed on the corners of an equilateral triangle. The electric field intensity at the centroid of the triangle is

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JEE Advanced

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PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 1 - Coulomb's Law and Electric Field>Exercise>Q 10

Two charges

Q_{1} = 18 μ C

and

Q_{2} = - 2 μ C

are separated by a distance

R

and

Q_{1}

is on the left of

Q_{2}

. The distance of the point where the net electric field is zero is

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JEE Advanced

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PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 1 - Coulomb's Law and Electric Field>Exercise>Q 11

An electric charge

q

exerts a force

F

on a similar electric charge

q

separated by a distance

r

. A third charge

\frac{q}{4}

is placed midway between the two charges. Now, the force

F

will

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JEE Advanced

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PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 1 - Coulomb's Law and Electric Field>Exercise>Q 12

Four electrical charges are arranged on the corners of a $10 c m$ , square as shown. What would be the direction of the resulting electric field at the centre point $P$ ?
Question Image

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JEE Advanced

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PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 1 - Coulomb's Law and Electric Field>Exercise>Q 13

The maximum electric field at a point on the axis of a uniformly charged ring is

E_{0}

. At how many points on the axis will the magnitude of the electric field be

\frac{E_{0}}{2}

MEDIUM

JEE Advanced

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PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 1 - Coulomb's Law and Electric Field>Exercise>Q 14

Three charges

+ Q_{1}

+ Q_{2}

and

q

are placed on a straight line such that

q

is somewhere in between

+ Q_{1}

and

+ Q_{2}

. If this system of charges is in equilibrium, what should be the magnitude and sign of charge

q

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JEE Advanced

IMPORTANT

PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 1 - Coulomb's Law and Electric Field>Exercise>Q 15

A point charge of

100 μC

is placed at

(3 \hat{i} + 4 \hat{j}) m

. Find the electric field intensity due to this charge at a point located at

(9 \hat{i} + 12 \hat{j}) m

HARD

JEE Advanced

IMPORTANT

PHYSICS for Joint Entrance Examination JEE (Advanced) Electrostatics and Current Electricity>Chapter 1 - Coulomb's Law and Electric Field>Exercise>Q 16

An oil drop, carrying six electronic charges and having a mass of

1.6 \times 10^{- 12} g

, falls with some terminal velocity in a medium. What magnitude of the vertical electric field is required to make the drop move upward with the same speed as it was formerly moving downward? Ignore buoyancy.

Two-point charges repel each other with a force of 100 N. One of the charges is increased by 10 % and the other is reduced by 10 %. The new force of repulsion at the same distance would be

Important Questions on Coulomb's Law and Electric Field

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Two-point charges repel each other with a force of $100 N$ . One of the charges is increased by $10 %$ and the other is reduced by $10 %$ . The new force of repulsion at the same distance would be