EMI (Lenz's and. Faradays Law)

1.         In electromagnetic induction, the induced e.m.f. in a coil is independent of                                           

• Change in the flux              

• Time         

• Resistance of the circuit  

• None of the above

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NGSS.HS-PS2-5

   Lenz's law is consequence of the law of conservation of 

• Charge                                   

• Momentum

•     Mass                                     

•   (d)   Energy

• 16 units                                 

• 39 units

             

• 67 units                                 

• 145 units

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NGSS.HS-PS2-5

NGSS.HS-PS3-5

•   10 weber                            

•   100 weber                               

The direction of induced e.m.f. during electromagnetic induction is given by                                        

            

• Faraday's law                     

• Lenz's law

             

• Maxwell's law                     

• Ampere's law

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NGSS.HS-PS2-5

Which action will increase the deflection of the galvanometer pointer?

• The magnetic pole is reversed

• The number of turns of coils is increased

• The coil is made from insulated wire

• The magnet is slowly pushed into the coil

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NGSS.HS-PS2-5

NGSS.HS-PS3-5

A coil having 500 square loops each of side 10 cm is placed normal to a magnetic flux which increases at the rate of 1.0 tesla/second. The induced e.m.f. in volts is

                                                                     

• 0.1                                         

• 0.5

              

•   1                                         

•    5

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NGSS.HS-PS2-5

  The total charge induced in a conducting loop when it is moved in magnetic field depends on       

                    

•    The rate of change of magnetic flux

• Initial magnetic flux only

• The total change in magnetic flux

• Final magnetic flux only  

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NGSS.HS-PS2-5

The north pole of a magnet is brought near a metallic ring. The direction of the induced current in the ring will be

•   Clockwise                             

• Anticlockwise

• Towards north                   

•   Towards south

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NGSS.HS-PS2-5

NGSS.HS-PS3-5

  The formula for induced e.m.f. in a coil due to change in magnetic flux through the coil is (here A = area of the coil, B = magnetic field)                                

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NGSS.HS-PS2-5