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Consider a capacitor consisting of two fixed semicircular plates of radius R separated by a distance d. A semicircular dielectric constant k almost fills up the space between the plates and passing throughthe centre. A constant potential difference V is maintained between the plates. If the slab is now rotated throughan angle θ. then the torque acting on the slab will be
  • a)
  • b)
  • c)
  • d)
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Consider a capacitor consisting of two fixed semicircular plates of ra...
The system maybe considered as the parallel combination of two capacitors c1 and cwhere. c1 and c2 are the capacitors of the parts with and without the dielectric. Thus, the equivalent capacitances

Therefore, the electrostatic energy of the system is 
Therefore. Torque 
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Consider a capacitor consisting of two fixed semicircular plates of radius R separated by a distance d. A semicircular dielectric constant k almost fills up the space between the plates and passing throughthe centre. A constant potential difference V is maintained between the plates. If the slab is now rotated throughan angle θ. then the torque acting on the slab will bea)b)c)d)Correct answer is option 'B'. Can you explain this answer?
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