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a.C. Of 50 hz and 1 a peak value flows in the primary coil of a transformer. The mutual inductance between primary and secondary coils is 1.5 h. Then peak value of induced emf across secondary coil is: (a) 75 volt (b) 150 volt (c) 225 volt (d) 300 volt q.2 when a current changes from 2a to 4a in 0.05 sec. In a coil, induced emf is 8 v. The self inductance of coil is: (a) 0.1 h (b) 0.2 h (c) 0.4 h (d) 0.8 h q.3 the equivalent inductance of two inductances is 2.4 henry when connected in parallel and 10 henry when connected in series. The difference between the two inductances is: (a) 2 henry (b) 3 henry (c) 4 henry (d) 5 henry q.4 if the rotational velocity of a dynamo armature is doubled, then induced

e.M.F will become: (a) half (b) two times (c) four times (d) unchanged q.5 two conducting coils are placed co-axially now a cell is connected in one coil then they will: (a) attract to each other (b) repel to each other (c) both (a) & (b) (d) they will not experience any force q.6 an electron beam is moving near to a conducting loop then the induced current in the loop: (a) clockwise (b) anticlockwise (c) both (d) no current q.7 a square coil of 0.01 m2 area is placed perpendicular to the uniform magnetic field of 103 weber/metre2. The magnetic flux linked with the coil is: (a) 10 weber (b) 105 weber (c) zero (d) 100 weber q.8 consider a metal ring kept on a horizontal plane. A bar magnet is held above the ring with its length along the axis of the ring. If the magnet is dropped freely the accelration of the falling magnet is (g is accelration due to gravity): (a) more than g (b) equal to g (c) less than g (d) depend on mass of magnet q.9 a coil of resistance 10 and an inductance 5h is connected to a 100 volt battery. Then energy stored in the coil is: (a) 125 erg (b) 125 j (c) 250 erg (d) 250 j q.10 if primary winding of a transformer were connected to a battery, the current in it will: (a) increase (b) remain constant (c) decrease (d) first (a) then (c)

Answer 1

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➡a.C. Of 50 hz and 1 a peak value flows in the primary coil of a transformer. The mutual inductance between primary and secondary coils is 1.5 h. Then peak value of induced emf across secondary coil is: (a) 75 volt (b) 150 volt (c) 225 volt (d) 300 volt q.2 when a current changes from 2a to 4a in 0.05 sec. In a coil, induced emf is 8 v. The self inductance of coil is: (a) 0.1 h (b) 0.2 h (c) 0.4 h (d) 0.8 h q.3 the equivalent inductance of two inductances is 2.4 henry when connected in parallel and 10 henry when connected in series. The difference between the two inductances is: (a) 2 henry (b) 3 henry (c) 4 henry (d) 5 henry q.4 if the rotational velocity of a dynamo armature is doubled, then induced

e.M.F will become: (a) half (b) two times (c) four times (d) unchanged q.5 two conducting coils are placed co-axially now a cell is connected in one coil then they will: (a) attract to each other (b) repel to each other (c) both (a) & (b) (d) they will not experience any force q.6 an electron beam is moving near to a conducting loop then the induced current in the loop: (a) clockwise (b) anticlockwise (c) both (d) no current q.7 a square coil of 0.01 m2 area is placed perpendicular to the uniform magnetic field of 103 weber/metre2. The magnetic flux linked with the coil is: (a) 10 weber (b) 105 weber (c) zero (d) 100 weber q.8 consider a metal ring kept on a horizontal plane. A bar magnet is held above the ring with its length along the axis of the ring. If the magnet is dropped freely the accelration of the falling magnet is (g is accelration due to gravity): (a) more than g (b) equal to g (c) less than g (d) depend on mass of magnet q.9 a coil of resistance 10 and an inductance 5h is connected to a 100 volt battery. Then energy stored in the coil is: (a) 125 erg (b) 125 j (c) 250 erg (d) 250 j q.10 if primary winding of a transformer were connected to a battery, the current in it will: (a) increase (b) remain constant (c) decrease (d) first (a) then (c)

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Answer 2

Answer:

300

Explanation:

t=1/50

T/4=time to attain peak

so t=1/200

E=1.5(1-0/1÷200)

E=300