Electromagnetic Induction Test

Result

Electromagnetic Induction Test - 75

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Weekly Quiz Competition

Question 1
4 / -1

The graph gives the magnitude B(t) of a uniform magnetic field that exists throughout a conducting loop, perpendicular to the plane of the loop. Rank the five regions of the graph according to the magnitude of the e.m.f. induced in the loop, greatest first

A
b > (d = e) < (a = c)

B
b > (d = e) > (a = c)

C
d < d < e < c < a

D
b > (a = c) > (d = e)

Solution
Question 2
4 / -1

Figure (i) shows a conducting loop being pulled out of a magnetic field with a speed v. Which of the four plots shown in figure (ii) may represent the power delivered by the pulling agent as a function of the speed v

A
a

B
b

C
c

D
d

Solution
Question 3
4 / -1

A rectangular loop is being pulled at a constant speed v, through a region of certain thickness d, in which a uniform magnetic field B is set up. The graph between position x of the right hand edge of the loop and the induced e.m.f. E will be

A

B

C

D

Solution
Question 4
4 / -1

The current i in an inductance coil varies with time t according to the graph shown in fig. Which one of the following plots shows the variation of voltage in the coil with time

A

B

C

D
Question 5
4 / -1

When a certain circuit consisting of a constant e.m.f. E, an inductance L and a resistance R is closed, the current in it increases with time according to curve 1. After one parameter (E, L or R) is changed, the increase in current follows curve 2 when the circuit is closed second time. Which parameter was changed and in what direction

A
L is increased

B
L is decreased

C
R is increased

D
R is decreased

Solution
Question 6
4 / -1

A flexible wire bent in the form of a circle is placed in a uniform magnetic field perpendicular to the plane of the coil. The radius of the coil changes as shown in figure. The graph of in the coil is represented by

A

B

C

D

Solution
Question 7
4 / -1

The current i in an induction coil varies with time t according to the graph shown
in figure. Which of the following graphs shows the induced e.m.f. (e) in the coil with time

A

B

C

D

Solution
Question 8
4 / -1

In an L -R circuit connected to a battery the rate at which energy is stored in the inductor is plotted against time during the growth of the current in the circuit. Which of the following best represents the resulting curve

A

B

C

D

Solution
Question 9
4 / -1

Switch S of the circuit shown in figure is closed at t = 0. If e denotes the induced z
e.m.f. in L and i the current flowing through the circuit at time t, which of the following graph is correct

A

B

C

D
Question 10
4 / -1

For previous objective, which of the following graphs is correct

A

B

C

D

Solution