Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>EXERCISE>Q 13

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Two very small spheres $A$ and $B$ are charged with $+ 10$ and $+ 20$ coulomb respectively and separated by a distance of $80 cm$ . The electric field at point on the line joining the centres of the two spheres will be zero at almost how much distance from $A$ ?

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Important Questions on Electric Charges and Fields

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Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>EXERCISE>Q 14

An electric dipole having charges

+ q

and

- q

are at a separation

r

. At distance

d > > r

along the axis of the dipole, the field is proportional to

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Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>EXERCISE>Q 15

Electric field lines about a negative point charge are

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Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>EXERCISE>Q 16

An electric dipole placed in a uniform electric field experiences, in general

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Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>EXERCISE>Q 17

An electric dipole consists of two opposite charges each of magnitude

2 μ C

separated by a distance

1 cm

. The dipole is placed in an external field of

10^{3} N C^{- 1}

. The maximum torque on the dipole is

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Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>EXERCISE>Q 18

A point

B

lies on the perpendicular bisector of an electric dipole of dipole moment

\vec{p}

. The distance of $B$ from the dipole is

r

(

r

is much larger than the size of the dipole). The electric intensity at

B

is proportional to

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Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>EXERCISE>Q 19

Which of the following statements is incorrect regarding the electric lines of forces?

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Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>EXERCISE>Q 20

The electric field due to a point charge at a distance

6 m

from it is

630 N C^{- 1}

. The magnitude of the charge is

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Gamma Question Bank for Medical Physics>Chapter 16 - Electric Charges and Fields>EXERCISE>Q 21

The net flux passing through a closed surface enclosing unit charge is