Electrodynamics Test

Result

Electrodynamics Test - 4

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Question 1
1 / -0

The following question has four choices out of which ONLY ONE is correct.

C, V, U and Q are capacitance, potential difference, energy stored and charge of a parallel plate capacitor respectively. The quantities that increase when a dielectric slab is introduced between the plates without disconnecting the battery are

A
V and C

B
V and U

C
U and Q

D
V and Q

Solution

As the battery is connected, V will remain the same. With the insertion of a dielectric slab, the capacitance of the capacitor will increase; hence charge will also increase.
Question 2
1 / -0

The following question has four choices out of which ONLY ONE is correct.

A potentiometer wire of length 10 m and resistance 20Ω is connected in series with a 15 V battery and an external resistance of 40Ω. A secondary cell of emf E in the secondary circuit is balanced by 240 cm long potentiometer wire. The emf E of the cell is

A
2.4 V

B
1.2 V

C
2.0 V

D
3 V

Solution

I = 15/60 = 0.25 A
Potential gradient = 20×0.25/10 = 0.5 V/m
PD across 240 cm = 0.5 × 2.4 = 1.2 V