Q5: A spherical capacitor is formed from two concentric spherical conducting shells separated by air. Inner sphere has radius a= 5 cm and outer has radius b= 10 cm. What is the capacitance (in pf) of the capacitor? A) 66.7 B) 24.8 Q6: Two identical capacitors C₁ and C₂ have the same charge. Then we insert dielectric material (K 2) between the plates of C₂ only. The ratio U₂/U, of the energies stored in C, and C₂ is: C) 1/2 B) 1/3 A) 3 D) 2 E) 1 9: What is the definition of conductivity? A) Current density Electric Field B) 3.5 C) 33.3 07: When a wire 5 m long with a diameter of 0.05 mm is connected to a 12 V battery, a current of 4 A flows through it. The resistivity (in 2.m) of the wire material is: A) 5.9 x 100 B) 7.9 x 1010 C) 3.5 x 10-¹0 D) 1.2 x 10" E) 2.4 x 10 08: Over a certain region of space, the electric potential is given by V(x) = 1500 x², where x in meter and V in volt. The electric field (in kV/m) at x = 0.8 m is: A) - 3.91 B) - 2.4i C) - 10.2i D) - 8.li Voltage Current B) 146.3 C) D) 41.7 Current Area E) 11.1 C) 117.0 D) (Voltage).(Current) E) A copper wire of radius 2 mm carries a current of 30 A. If Copper has 8.5 x 1029 free electrons/m³, then the drift speed of electrons (in μm/s) is: D) 87.8 E) - 12.3 Electric Field Current density E) 175.5
Q5: A spherical capacitor is formed from two concentric spherical conducting shells separated by air. Inner sphere has radius a= 5 cm and outer has radius b= 10 cm. What is the capacitance (in pf) of the capacitor? A) 66.7 B) 24.8 Q6: Two identical capacitors C₁ and C₂ have the same charge. Then we insert dielectric material (K 2) between the plates of C₂ only. The ratio U₂/U, of the energies stored in C, and C₂ is: C) 1/2 B) 1/3 A) 3 D) 2 E) 1 9: What is the definition of conductivity? A) Current density Electric Field B) 3.5 C) 33.3 07: When a wire 5 m long with a diameter of 0.05 mm is connected to a 12 V battery, a current of 4 A flows through it. The resistivity (in 2.m) of the wire material is: A) 5.9 x 100 B) 7.9 x 1010 C) 3.5 x 10-¹0 D) 1.2 x 10" E) 2.4 x 10 08: Over a certain region of space, the electric potential is given by V(x) = 1500 x², where x in meter and V in volt. The electric field (in kV/m) at x = 0.8 m is: A) - 3.91 B) - 2.4i C) - 10.2i D) - 8.li Voltage Current B) 146.3 C) D) 41.7 Current Area E) 11.1 C) 117.0 D) (Voltage).(Current) E) A copper wire of radius 2 mm carries a current of 30 A. If Copper has 8.5 x 1029 free electrons/m³, then the drift speed of electrons (in μm/s) is: D) 87.8 E) - 12.3 Electric Field Current density E) 175.5
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Transcribed Image Text:Q5: A spherical capacitor is formed from two concentric spherical conducting shells separated by air.
Inner sphere has radius a= 5 cm and outer has radius b= 10 cm. What is the capacitance (in pF)
of the capacitor?
A) 66.7
B) 24.8
9: What is the definition of conductivity?
A)
Current density
Electric Field
B)
06: Two identical capacitors C₁ and C₂ have the same charge. Then we insert dielectric material (K
2) between the plates of C₂ only. The ratio U₂/U, of the energies stored in C, and C₂ is:
C) 1/2
B) 1/3
A) 3
D) 2
E) 1
3.5
C) 33.3
07: When a wire 5 m long with a diameter of 0.05 mm is connected to a 12 V battery, a current of 4 A
flows through it. The resistivity (in 2.m) of the wire material is:
A) 5.9 x 10-10
B) 7.9 x 1010
C) 3.5 x 10-¹0
D) 1.2 x 10"
E) 2.4 x 10¹
08: Over a certain region of space, the electric potential is given by V(x) = 1500 x², where x in meter
and V in Volt. The electric field (in kV/m) at x = 0.8 m is:
A) - 3.9
B) - 2.4i
C) - 10.2i
D) - 8.1
Voltage
Current
B) 146.3
D) 41.7
Current
Area
E) 11.1
C) 117.0
D) (Voltage).(Current) E)
A copper wire of radius 2 mm carries a current of 30 A. If Copper has 8.5 x 1028 free
electrons/m³, then the drift speed of electrons (in μm/s) is:
D) 87.8
E) - 12.3/
Electric Field
Current density
E) 175.5
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