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Class 12 › Physics › Electric Potential & Capacitance
CBSE2021Class Class 12 · Physics3 Marks · Short✅ Verified
Why does the electric field inside a dielectric decrease when it is placed in an external electric field?
✅ Answer & Solution
๐ Explanation: Polarization of Dielectric
Step 1 โ External Field Applied (Eโ):
โข External electric field <b>Eโ</b> is applied to the dielectric.
Step 2 โ Polarization Occurs:
โข The external field causes slight separation of positive and negative charges within molecules.
โข This creates an <b>induced electric field E_p</b> (polarization field).
โข <b>E_p opposes Eโ</b> (directed opposite).
Step 3 โ Net Field Inside Dielectric:
E_net = Eโ โ E_p = Eโ / K
Where <b>K = Dielectric Constant</b> (K > 1)
Step 4 โ Conclusion:
Since K > 1, E_net < Eโ
โด <b>Electric field inside the dielectric decreases</b> due to the opposing polarization field.