Consider two oppositely charged, isolated parallel plates separatedby distance D
ID: 1669992 • Letter: C
Question
Consider two oppositely charged, isolated parallel plates separatedby distance D, with capacitance C, chargeQ, and stored energy U. For each statement below,select "True" or "False".1. When D is doubled, U is unchanged.
2. Increasing D, leaves the E fieldunchanged.
3. Because of energy conservation, inserting a dielectricleaves U unchanged.
4. When D is doubled, C is halved.
5. When D is halved, Q stays the same.
6. Because of charge conservation, inserting a dielectricleaves C unchanged.
7. Inserting a dielectric does not affect Q.
Explanation / Answer
we have some equations here (Q is constant) C=*k*A/D U=1/2*C*Q=1/2*Q2/C=1/2*V2*C 1. When D is doubled, U isunchanged.FALSE 2. Increasing D, leaves the Efield unchanged.
TRUE 3. Because of energy conservation, inserting adielectric leaves U unchanged. FALSE (need work to do it) 4. When D is doubled, C is halved.
TRUE 5. When D is halved, Q stays thesame TRUE 6. Because of charge conservation, inserting adielectric leaves C unchanged.
FALSE 7. Inserting a dielectric does not affectQ.
TRUE