Q1. Answer Acceptable answers Mark (a) C (1) a(ii) In the cloud : reason 3 (1) At the tower: reason 2 (1) (2) a(iii) An explanation linking Discharged/ becomes zero (2) gained electrons / negative the charge was  charge neutralised (1) by a transfer/flow  of electrons (1) (b) Substitution (1) 52 = 2600 × time T = Q / I Full marks for transposition correct answer even if no (3) time = 52 / 2600 (1) working is evident evaluation 0.02 (s) (1) An explanation linking mention of earthing (c) (2) two of the following discharged / neutral all objects at the same charges flow  potential through the metal wire to the ground /  earth preventing build-up  of (excess) charge (2) Q2. Answer Acceptable Mark answers (a)(i) B electrons (1) (a)(ii) An explanation negative charge linking (reject protons and (negative) positive charge for electrons transfer this mp) moves (1) because of cloth loses friction/from cloth electrons/negative (to base) (1) charge (to base) = 2 (2) A suggestion to cup/metal is a include charge conductor ignore (any) could move (a)(iii) metal is not an through cup /metal insulator to earth/ (1) (cup is) ground / to/ earthed (1) through student's (2)
Q1. Answer Acceptable answers Mark (a) C (1) a(ii) In the cloud : reason 3 (1) At the tower: reason 2 (1) (2) a(iii) An explanation linking  the charge was neutralised (1)  by a transfer/flow of electrons (1) Discharged/ becomes zero gained electrons / negative charge (2) (b) Substitution (1) 52 = 2600 × time transposition time = 52 / 2600 (1) evaluation 0.02 (s) (1) T = Q / I Full marks for correct answer even if no working is evident (3) (c) An explanation linking two of the following  charges flow through the metal wire  to the ground / earth  preventing build-up of (excess) charge (2) mention of earthing discharged / neutral all objects at the same potential (2) Q2. Answer Acceptable answers Mark (a)(i) B electrons (1) (a)(ii) An explanation linking (negative) electrons transfer (1) because of friction/from cloth (to base) (1) negative charge (reject protons and positive charge for this mp) moves cloth loses electrons/negative charge (to base) = 2 (2) (a)(iii) A suggestion to include charge (any) could move through cup /metal (1) (cup is) earthed (1) cup/metal is a conductor ignore metal is not an insulator to earth/ ground / to/ through student's (2)
p2_revision_pack_mark_scheme.docx