Edexcel IGCSEPhysicsGeneral Applications6 Marks
A student investigates the motor effect. A wire carrying a current is placed in a uniform magnetic field.
- (a)(i)State the rule used to determine the direction of the force on the wire.[1]
- (a)(ii)Describe how the magnitude of the force on the wire can be increased.[2]
- (b)A wire of length 0.15 m carrying a current of 2.0 A experiences a force of 0.030 N when placed perpendicular to a magnetic field. Calculate the magnetic field strength.[3]
Mark scheme
Marking points from the official mark scheme. The mark or mark type is shown in brackets.
- 2(a)(i)
- B1 for Fleming's Left-Hand Rule (or motor rule)
- 2(a)(ii)
- B1 for increase current (in the wire)
- B1 for increase magnetic field strength (e.g., use a stronger magnet, add more turns to electromagnet)
- 2(b)
- M1 for F = BIL OR B = F / (IL)
- C1 for correct substitution: B = 0.030 / (2.0 × 0.15)
- A1 for 0.10 T (allow 0.1 T)
Write your answer and get it marked
On Oracle Prep you can write or photograph your own answer and have it marked by AI against this mark scheme, with feedback on what you missed.
Sign up free →