Question of Exercise 1

Magnetics of Class 12

Question
A charged particle of specific charge α  is released from origin at time t = 0 with velocity in magnetic field . The coordinates of the particle at time  are (specific charge α= q/m)

Answer

Option 1

Option 2

Option 3

Option 4

Frequently Asked Questions

State two uses of a convex mirror

Solution:

Explanation:

The convex mirror reflects the light outwards and is therefore it is used to spread the light.

The two uses of convex mirror.

It is used as a rear view mirror in the vehicles.

It is used in the street light reflectors.

It is used as a sunglass.

Final Answer:

The convex mirror is used as vehicles mirror,magnifying glasses.

Name three bad conductors of heat

Solution:

Explanation:

The object is bad conductors of heat means it is not conducted the heat easily.

The bad conductor heats are Plastic,rubber,wood.

Final Answer: 

The bad conductors of heat are plastic,rubber,wood,glass.

 

What is the force between two small charged spheres having charges

 of 2×10^-7C and 3× 10^-7 C placed 30 cm apart in air?

 

 

Solution:

Explanation:

Charge on the first sphere, q1=2×10-7C

Charge on the second sphere, q2=3×10-7C  

Distance between the spheres, r=30 cm=0.3m

charged spheres

Final Answer:

Hence, force between the two small charged spheres is 6×10-3N .

The charges are of same nature. Hence, force between them will be repulsive

 

 

The ground state energy of hydrogen atom

 is -13.6 eV. What are the kinetic and
potential energies of the electron in this state?
Answer
Ground state energy of hydrogen atom, E = - 13.6 eV
This is the total energy of a hydrogen atom. Kinetic energy is equal to the negative of
the total energy.
Kinetic energy = - E= - (- 13.6) = 13.6 eV
Potential energy is equal to the negative of two times of kinetic energy.
Potential energy = - 2 x (13.6) = - 27.2 eV

 

Solution:

Explanation:

Ground state energy of hydrogen atom is E=−13.67eV 

The kinetic energy of the electron is given as: KE=−E =+13.67eV 

The potential energy of the electron is given as: PE=−2×KE =−27.2eV

Final Answer:

Hence,

The kinetic energy of the electron is +13.67eV 

The potential energy of the electron is −27.2eV

 

 

The following configuration of gate equivalent to

configuration

A: NAND

B: XOR

C: OR

D: None of these

 

Solution:

Explanation:

The given output can be written as 

Y=(A+B)(¯A+¯B)

Y=AA+A¯B+A¯B +B¯B

Y=0+A¯B+A¯B +0

Y=A¯B+A¯B

This the output of XOR gate.

Final Answer:

The correct option is (B) ( XOR ) 

 

 

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