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1
A magnetic flux of 400 micro-weber passing through a coil of 1200 turns is reversed in 0.1 sec. The value of emf induced in the coil is?
 
A) 9.6 V
B) 4.8 V
C) 7.2 V
D) None of these
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2
Five identical capacitors each of value 2 farads are connected between the pair of nodes (a, c), (c, d), (a, d), (b, d) and (c, b). If all the capacitors are initially uncharged, the equivalent capacitance between the nodes a and b will be?
 
A) 3F
B) 5F
C) 1F
D) 2F
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3
A coil of 1000 turns produces a flux of 2 m W b while carrying a current of 1 A. The energy stored in its magnetic field is?
 
A) 0.25J
B) 0.50J
C) 1J
D) 2J
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4
A transformer with a turn’s ratio of 1:10 is terminated by a 100 ohms resistance on the secondary side. The impedance seen on the primary side will be?
 
A) 10 K ohms
B) 100 ohms
C)  10 ohms
D) 1 ohm
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5

Two coils having self-inductancesof 4 mH and 9 m H are placed and connected in such a manner to offer minimum possible inductance. The value of the minimum inductance is?

 
A) 1mH
B) 7mH
C) 13mH
D) 19mH
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