Test on EMI

A coil of 100 turns carries a current of 5 mA and creates a magnetic flux of 10^-5Weber.The inductance is

• 0.2mH

• 2mH

• 0.02mH

• 20mH

If L=1000microH, current changes to 1A to 0.1 second. What is the EMF produced

• 1mV

• 100mV

• 10mV

• 0.1V

In a coil when current changes from 10A to 2 A in time 0.1second, induced emf is 3.28V. What is self inductance of coil

• 4H

• 0.4H

• 0.04 H

• 5 H

An inductor of 5H carries steady current of 2A. How can a 50 V self induced EMF be made to appear in the inductor

• T=0.1 sec

• T=0.2 sec

• T=0.3 sec

• T=0.4 sec

What is the mutual inductance of a pair of coil if a current change of 6 A in one coil causes the flux in the second coil of 2000 turns to change by 12x10^(-4) Weber per turn

• 0.1H

• 0.2H

• 0.3H

• 0.4H

What is the value of EMF generated and direction of induced current if rods move to right side

• 0.1V

• 0.3V

• 0.5V

• 0.8V

Current in circuit falls from 5 A to 0 A in 0.1 sec. if an average EMF of 200 V induced , give estimation of self induction in the circuit

• 4H

• 3H

• 2H

• 1H

A pair of adjacent coil has a MI of 1.5 H. If current in one coil changes from 0 to 20A in 0.5 sec, what is change of flux

• 10wb

• 20wb

• 30wb

• 40 wb

While keeping area of cross-section of solenoid same, the number of turns and length of solenoid are both doubled. The self inductance of coil will be

• Halved

• Doubled

• 1/4 times the original value

• Unaffected

If N is the number of turns in a coil, the value of self-inductance varies as

• N^0

• N

• N^2

• N^-2