19. Measurement f magnetic flux \'d through a small area \'dA and inclination \'

Question

19. Measurement f magnetic flux 'd through a small area 'dA and inclination ' is (a) B/dA cos (b) B dA cos (c) B dA /cos (d) None 20. I he negative sign in the equation (a) Faraday's law (b) Biot-savart law -N 10sAlt is due to? (c) Lenz's law (d) None 21. The e.m.f (e) generated in A.C generator is (a) NBAco sin t (b) NBAdo cos t (c) N BA/ sin t (d) None 22. Back e.m.fis related to (a) DC generator (b) AC generator (c) DC Motor (d) All 23. Motional e.mf -$(6XB_d ls measured due a conductor moves in (a) Electric field (b) EM Field (c) Magnetic field (d) None 24. Induced electric fields is due to magnetic flux change through (a) Stationary conductor (b) Non conservative field c) Non electrostatic origin (d) All of the above 25. Which electric device use Eddy current principle or design (a) Metal detector (b) AC generator (c) DC Motor (d) None 26. Maxwell's equations is due to encl dt fa.dl = (ic + 60' ddbE dt (b) encl (e) All of the above

Explanation / Answer

19.

Flux= B dA cos (theta)

Option (b) is correct

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20. Negative sign is due to Lenz law.

Option (c) correct.

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21.

e= NBA sin (wt)

Option (a) is correct

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22.

Back emf generated in DC motor.

Option (c) is correct

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23. Option (c) is correct.

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Comment in case any doubt.. good luck

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