A) The induced emf in a circuit is proportional to the magnetic flux through the circuit. true false [2.5 points] 0 attempt(s) made (maximum allowed for credit = 1) (b) There can be an induced emf at an instant when the flux through the circuit is zero. true false [2.5 points] 0 attempt(s) made (maximum allowed for credit = 1) (c) Lenz's law is related to the conservation of energy. true false [2.5 points] 0 attempt(s) made (maximum allowed for credit = 1) (d) The inductance of a solenoid is proportional to the rate of change of the current in it. true false