Question

1.

What resistance can be connected in parallel with a 20 Ω to obtain the equivalent resistance as 4Ω?

Group of answer choices

3

10

5

15

What resistance can be connected in parallel with a 20 Ω to obtain the equivalent resistance as 4Ω?

Group of answer choices

3

10

5

15

2.  

A battery ε = 40 V with internal resistance (r) of 1 Ω is connected in series with two resistors R₁ = 22 Ω and R₂ = 17 Ω. The potential drop across each resistor will be

Group of answer choices

23 V, 18 V

21 V, 20 V

1.82 V, 2.35 V

22 V, 17 V

3.

Equivalent capacitor for the above circuit is

Group of answer choices

less than 2.0 F

In between 4.0 F and 6.0 F

higher than 6.0 F

In between 2.0 F and 4.0 F

4.

An electron, starting from rest, falls through a potential rise of 40 V! So its final speed will be (using an equation : qV = ½ m_ev_f² – ½ m_e v_i² and m_e = 9.1 × 10⁻³¹ kg)

Group of answer choices

5.3 × 10⁶ m/s                     

3.8 × 10⁶ m/s               

3.8 × 10¹¹ m/s                     

13.0 × 10¹² m/s         

5.

Three point charges are placed on the x-axis this way : +2.0 μC at x = 20 cm, −3.0 μC at x = 30 cm, and −4.0 μC at x = 40 cm. Find the absolute potential on the axis at x = 0.

Group of answer choices

+ 90 V

+ 90 kV

- 90 V

- 90 kV

Answer 1