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Consider the following statements and ch...

Consider the following statements and choose the correct option.
. I The torque on the dipole is p x E
II The resultant force on the dipole is zero.

A

I and It bath are correct

B

I and II both are incorrect

C

I is correct and II is incorrect

D

I is incorrect and II is correct

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the statements about the electric dipole, we will analyze each statement step by step. ### Step 1: Analyze Statement I **Statement I:** The torque on the dipole is \( \vec{\tau} = \vec{p} \times \vec{E} \). 1. **Understanding Torque on a Dipole:** - The torque (\( \vec{\tau} \)) experienced by an electric dipole in an electric field (\( \vec{E} \)) is given by the vector cross product of the dipole moment (\( \vec{p} \)) and the electric field (\( \vec{E} \)). - Mathematically, this is expressed as: \[ \vec{\tau} = \vec{p} \times \vec{E} \] - This means that the torque is dependent on both the magnitude and direction of the dipole moment and the electric field. **Conclusion for Statement I:** This statement is **correct**. ### Step 2: Analyze Statement II **Statement II:** The resultant force on the dipole is zero. 2. **Understanding the Resultant Force on a Dipole:** - An electric dipole consists of two equal and opposite charges (+Q and -Q) separated by a distance \( d \). - When placed in a uniform electric field, the force on the positive charge is \( \vec{F}_{+} = +Q \vec{E} \) and the force on the negative charge is \( \vec{F}_{-} = -Q \vec{E} \). - The net force (\( \vec{F}_{net} \)) acting on the dipole can be calculated as: \[ \vec{F}_{net} = \vec{F}_{+} + \vec{F}_{-} = +Q \vec{E} - Q \vec{E} = 0 \] - This indicates that the forces on the two charges cancel each other out, resulting in no net force acting on the dipole. **Conclusion for Statement II:** This statement is also **correct**. ### Final Conclusion Both statements are correct. Therefore, the correct option is: - **Option A:** Both statements are correct.
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