5. When a voltage is generated by rotating a coil in a magnetic field at a const

Question

5. When a voltage is generated by rotating a coil in a magnetic field at a constant rate, the period of the voltage equals the time that it talkes for the coil to rotate through a. 1 rad. b. x/2rad. d. 2? rad. 6. A coil is placed in a changing magnetic field and an emf is induced. What happens to the induced em if the rate of change of magnetic field doubles? a. The emf quadruples b. The emf increases by a factor of 16 e· d. There is no change. The emf doubles. 7. According to Lenz's law the direction of an induced current in a conductor will be that which tends to produce which of the following effects? a enhance the effect which produces it b. produce a greater heating effect c. produce the greatest voltage d. oppose the effect which produces it 8. A coll is placed in a magnetic field and has a fux ?" through it. The coll is st ed so that its area reduces to 60% of its original value. If the plane of the coll stays the same and the fix through it remains the same, how must the magnetic field change? It must increase by 60%. b. It must increase by 120%. It must decrease by 40%. It must increase by 67%. 9. A uniform 1.1-T magnetic field passes What Aux passes through the loop? a. c. d. perpendicularly through the plane of a wire loop 0A0nHn area. a. 4.4Tm b. 0.44Tm2 c. 3Tm d. 0.18Tm e. 1.3Tm 10. A uniform 1.5-T magnetic field passes perpendicularly through the plane of a wire loop 0.30 m? in area. What fux passes through the loop? a. 0.135 Tm b. 5.0Tm2 c. 0.45Tm d. 0.25Tm2

Explanation / Answer

5.If angular speed is w

induced emf will also change with w

so period is when it rotate by 2*pi

option(d)

6.emf=rate of change of flux so

emf will double so

option (d)

7.It will oppose the cause which produce it

so option(d)

8.Flux=B*area

if A'=0.6A=>flux'=0.6*A*B'=BA

B'=1.67B

so increase by 66.7%

option(d)

9 flux=B*Area=1.1*0.4=0.44Tm^2

option(b)

10.

flux=1.5*0.3=0.45Tm^2

option(c)

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