Question 12: How does a current-carrying coil behaves like a bar magnet? When current passes through a current carrying coil (e-g, a solenoid) it behaves…
Question 1: Make a list of similarities and differences between the motor effect and electromagnetic induction in a moving wire (the dynamo effect). ANSWER A…
Question 3: What factors limit the size of the back emf? ANSWER The magnitude of the back emf induced in a coil is directly proportional…
Question 2: For a simple motor, why must the back emf always be smaller than the applied potential difference? ANSWER We know in an electric…
Question 4: Why does the back emf tend to decrease as the rate of doing work increases? ANSWER We have Here I = current provided…
ANSWER Faraday’s law of electromagnetic induction states that the magnitude of the induced emf ε is equal to the time rate of magnetic flux through…
ANSWER The relationship will be dimensionally correct if both sides of the equation have the same dimensions. Take LHS. The dimensions of ε are given…
Question 7: Give formula for the flux linkages in terms of angular orientation. ANSWER Suppose a coil is placed in a uniform magnetic field of…
Question 5: What will be the path of a charged particle moving in a uniform magnetic field at any arbitrary angle with the field? ANSWER…
Question 6: An electron does not suffer any deflection while passing through a region. Are you sure that there is no magnetic field? ANSWER No,…