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This mock test of Electromagnetic Induction NAT Level - 2 for IIT JAM helps you for every IIT JAM entrance exam.
This contains 10 Multiple Choice Questions for IIT JAM Electromagnetic Induction NAT Level - 2 (mcq) to study with solutions a complete question bank.
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*Answer can only contain numeric values

QUESTION: 1

A wire of fixed length is wound on a solenoid of length **‘ l ’** and radius

Solution:

Length of wire = N2πr = Constant (= *C*, suppose)

∴ Self inductance will become **2 L.**

The correct answer is: 2

*Answer can only contain numeric values

QUESTION: 2

The number of turns, cross-sectional area and length for four solenoids are given in the following table.

The solenoid with maximum self inductance is :

Solution:

By putting the given values, it can be seen that it is maximum for solenoid number 4.

The correct answer is: 4

*Answer can only contain numeric values

QUESTION: 3

In an ideal transformer, the voltage and the current in the primary are **200 volt** and

Solution:

Voltage in primary **v _{p} = 200volt**

Current in primary **i _{p} = 2amp**

Voltage in secondary **v _{s} = 200volt**

The relation for the current in the secondary is

The correct answer is: 0.2

*Answer can only contain numeric values

QUESTION: 4

In a ** L-R** growth circuit, inductance and resistance used are

Solution:

The correct answer is: 100

*Answer can only contain numeric values

QUESTION: 5

A long coaxial cable consists of two thin walled conducting cylinders with inner radius **2 cm** and outer radius

Solution:

The magnetic field inside is only due to current of inner cylinder.

Magnetic field energy density is not uniform in the space in between cylinders. At distance *r* from the centre

Energy in volume of element (length *l*)

Using values *U* = 140 *nJ*

The correct answer is: 140

*Answer can only contain numeric values

QUESTION: 6

A uniform magnetic field exists in region given by A rod of length **5 m** is placed along

Solution:

The correct answer is: 25

*Answer can only contain numeric values

QUESTION: 7

Figure shows a square loop of side **1 m** and resistance

Solution:

The correct answer is: 1

*Answer can only contain numeric values

QUESTION: 8

The magnetic field of a cylindrical magnet that has a pole-face radius **2.8 cm** can be varied sinusoidally between minimum value

Solution:

Magnitude of the amplitude

The correct answer is: 240

*Answer can only contain numeric values

QUESTION: 9

In the figure, a long thin wire carrying a varying current lies at a distance ** y** above one edge of a rectangular wire loop of length

Solution:

The magnetic field at point * P*, is

The magnetic flux through the shaded strip, is

∴ total magnetic flux through rectangular loop is

∴ induced emf in the loop is

The correct answer is: 8

*Answer can only contain numeric values

QUESTION: 10

In the figure shown ** ABCDEFGH** is a square conducting frame of side

Solution:

The induced emf in loop *ABHFG *

The induced emf in loop ** BCDH** and

= 1 × 10 = 10

= 1 × 10 = 10

10 – (

⇒ ** x – 4y + z = – 10** ...(1)

*KVL* in right loop : **10 – 2 x – (x – y) – (x – z) = 0**

⇒ **–4 x + y + z = –10** ...(2)

By equation (1) and (2) it is seen that ** x – y = 0** ⇒ no current in

(This can also be seen by symmetry)

This makes solution very simple now the circuit is,

Assume ** V_{B} = 0**, and

⇒ **V = 0** ⇒ no current in *FB*

∴ circuit is :

∴ rate of heat production = **(40)2/8 = 200 Watt.**

Note : If you are not able to observe the symmetry or decide

** x – y = 0**, then write

Solving (1), (2) and (3) you will get

where

The correct answer is: 40

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