A student connects two lamps in the circuit shown.The emf of the two batteries is different
Which of the following statements are correct ?
i. When keys 1, 2, 3 and 4 are closed, bulbs A and B will both glow
ii. When key 2 and 4 are closed bulb A will glow
iii.When 1 and 4 are closed, bulb A will glow
iv.When 2, 3 and 4 are closed, both A and B will glow