Electrostatics Test

Result

Electrostatics Test - 134

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Weekly Quiz Competition

Question 1
4 / -1

In the given figure each plate of capacitance C has partial value of charge

A
CE

B

C

D

Solution
Question 2
4 / -1

The plates of a capacitor are charged to a potential difference of 320 volts and are then connected across a resistor. The potential difference across the capacitor decays exponentially with time. After 1 second the potential difference between the plates of the capacitor is 240 volts, then after 2 and 3 seconds the potential difference between the plates will be

A
200 and 180 V

B
180 and 135 V

C
160 and 80 V

D
140 and 20 V

Solution
Question 3
4 / -1

The plates of a parallel plate condenser are pulled apart with a velocity v. If at any instant their mutual distance of separation is d, then the magnitude of the time of rate of change of capacity depends on d as follows

A
1/d

B
1 / d²

C
d⁵

D
d

Solution
Question 4
4 / -1

A network of four capacitors of capacity equal to C₁ = C, C₂ = 2C, C₂ = 3C and C₄ = 4C are conducted in a battery as shown in the figure. The ratio of the charges on C₂ and C₄ is

A

B

C

D

Solution
Question 5
4 / -1

The voltage of clouds 4 × 10⁶ volt with respect to ground. In a lightning strike lasting 100 m sec, a charge of 4 coulombs is delivered to the ground. The power of lightning strike is

A
160 MW

B
80 MW

C
20 MW

D
500 MW

Solution
Question 6
4 / -1

An electron is released from the bottom plate A as shown in the figure (E = 10⁴N / C). The velocity of the electron when it reaches plate B will be nearly equal to

A
0.85 × 10⁷ m/s

B
1.0 × 10⁷ m/s

C
1.25 × 10⁷ m/s

D
1.65 × 10⁷ m/s

Solution
Question 7
4 / -1

A ball of mass 1g and charge 10^–8 C moves from a point A. Where potential is 600 V to the point B where potential is zero. Velocity of the ball at the point B is 20 cm/s. The velocity of the ball at the point A will be

A
22.8 cm/s

B
228 cm/s

C
16.8 m/s

D
168 m/s

Solution
Question 8
4 / -1

What will be the capacity of a parallel-plate capacitor when the half of parallel space between the plates is filled by a material of dielectric constant ɛ_r? Assume that the capacity of the capacitor in air is C.

A

B

C

D

Solution
Question 9
4 / -1

Point charge q moves from point P to point S along the path PQRS (figure shown) in a uniform electric field E pointing coparallel to the positive direction of the X–axis. The co-ordinates of the points P, Q, R and S are(a, b, 0) (2a, 0, 0) (a, –b, 0) and (0, 0, 0) respectively, The work done by the field in the above process is given by the expression

A

B

C

D

Solution
Question 10
4 / -1

The variation of potential with distance R from a fixed point is as shown below. The electric field at R = 5 m is

A
2.5 volt/m

B
–2.5 volt/m

C
2/5 volt/m

D
–2/5 volt/m

Solution