induced emf ex

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1. (a) If the bar magnet causes a magnetic field with a flux density of 20mTperpendicular to the plane of area A how much flux will be contained by this
area if it is 10cm?
(b) In the uniform magnetic field has a flux density of 5 x 10-5T and is at an angle of 750 to the region of area A. How much flux will be contained by this
area if it is 1 cm2?
2. Zora takes a wire and winds it into a coil of ten circular turns with a radius of 5 cm and then holds this in a magnetic field with strength of 20 mT. What is
the flux linkage?
3. Zora has a wire coil of 120 circular turns with a radius of 5 cm, held in a magnetic field with strength of 20 mT. She removes it from within the magnetic
field to a place completely outside the field in 0.02 s. What emf is induced in her coil?
4. (a) A narrow coil of 10 turns and area 4 x 10-2 m2 is placed in a uniform magnetic field of flux density of 10-2 T so that the flux links the turns normally.
Calculate the average induced emf in the coil if it is removed completely from the field in 0.5s.
(b) When the coil is initially perpendicular to B, then the coil is turned through 60 in 0.2 s. Calculate the average induced emf in the coil.
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