Electric fields

Question 1

Electric field direction

Answer 1

Positive test charges move from a high potential to a low potential. Electric field lines show the direction that a positive test charge accelerates, from high to low potential

Question 2

State and explain the experimental change which can be done to reduced photocurrent

Answer 2

• The terminals of the power supply could be reversed
• This means photoelectrons would do work against the electric field to cross the potential difference
• The potential difference is now negative as opposed to positive

Question 3

Label graph + what could replace KE?

Answer 3

KE could be replaced with Stopping potential as stopping potential is the measure of the kinetic energy

Question 4

Typical unit for electric field strength

Answer 4

NC-1 force per unit charge