You're viewing 1 free preview question for Physics HL — subscribe to unlock 150 more, plus the Full Question Bank, Mock Papers & Worksheets.Upgrade

Current and Circuits · Paper 2 — Free Physics HL Practice Questions

1ChallengeSAQ-LElectric charge and current7 marksPaper 2~11 min

Two point charges,

q_1 = +3.0 \times 10^{-9}\,\text{C}

and

q_2 = -5.0 \times 10^{-9}\,\text{C}

, are fixed on the

x

-axis.

q_1

is at

x = 0

and

q_2

is at

x = 0.40\,\text{m}

(a)

Determine the magnitude and direction of the net electric field at

x = 0.20\,\text{m}

. [3 marks]

(b)

State why no point between the two charges has zero electric field, and determine the

x

-coordinate of the point on the

x

-axis where the net electric field is zero. [2 marks]

(c)

The charges are placed in a non-conducting medium of relative permittivity

\varepsilon_r = 5

. Calculate the ratio of the electric field magnitude at

x = 0.20\,\text{m}

in the medium to that in vacuum, and hence evaluate whether ignoring the medium introduces a significant error. [2 marks]

Solutions

Questions 2-151

Unlock these questions with Premium

That's every free question here — 1 of 151.

+150 more questions, plus Mock Papers & Worksheets, are waiting in Premium.