Physics Crash Course NEET>Chapter 12 - Electrostatics>Level 2>Q 41

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An electric dipole having point charges $+ q$ and $- q$ , separated by a fixed distance $d$ is kept under the influence of a uniform electric field $E$ , such that the axis of the dipole is making an angle $θ = 45 °$ with the direction of $E$ , as shown in the figure. If the electric dipole is allowed to rotate in the $x y$ -plane with its center being stationary, what is the magnitude of the net torque acting on the electric dipole?

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Important Questions on Electrostatics

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Physics Crash Course NEET>Chapter 12 - Electrostatics>Level 2>Q 42

An electric dipole is placed at an angle of

30 °

with an electric field intensity,

2 \times 10^{5} N C^{- 1}

. It experiences a torque equal to

4 N m

. The charge on the dipole, if the dipole length is

2 cm

, is

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Physics Crash Course NEET>Chapter 12 - Electrostatics>Level 2>Q 43

If the flux of the electric field through a closed surface is zero, then

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Physics Crash Course NEET>Chapter 12 - Electrostatics>Level 2>Q 44

A charge

q

is placed at the centre of a cube. The electric flux passing through the cube is

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Physics Crash Course NEET>Chapter 12 - Electrostatics>Level 2>Q 45

On increasing the distance between the plates of a parallel plate condenser, which of the following statement is true?

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Physics Crash Course NEET>Chapter 12 - Electrostatics>Level 2>Q 46

A capacitor is charged by using a battery, which is then disconnected. A dielectric slab is then slipped between the plates, which results in

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Physics Crash Course NEET>Chapter 12 - Electrostatics>Level 2>Q 47

The plates of a parallel plate capacitor have charges

Q

and

- 2 Q

. Its capacitance is

C

. The potential difference between its plates will be,

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Physics Crash Course NEET>Chapter 12 - Electrostatics>Level 2>Q 48

In a parallel plate capacitor, the distance between the plates is

d

and the potential difference across the plates is

V

. The energy stored per unit volume between the plates of the capacitor is,

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Physics Crash Course NEET>Chapter 12 - Electrostatics>Level 2>Q 49

The plate separation in a parallel plate condenser is $d$ and plate area is $A$ . If it is charged to $V$ volt & battery is disconnected then the work done in increasing the plate separation to $2 d$ will be