Question

6. Which of the following is true about electric field lines. a) Electric field line intersect each other b) Electric field lines are directed away (outwards) from the negative charge c) Electric field lines are directed towards the positive charge d) None of the above 7. An electron is travelling at 3.20 !! 10? m/s perpendicular to an external magnetic field of magnitude 2.20 !! 10?¹T. Determine the magnitude of magnetic force acting on the electron. A. 1.90 !! 10?¹ N B. 1.00 !! 10?¹ N C. 3.12 !! 10?¹ N D. None of the above 8. Two parallel wires carrying current in same direction will a) Do not affect each other b) Be repelled first and then attract each other c) Attract each other d) None of the above e) Incomplete statement thus result cannot be found 9. Units of electric potential energy are A) N/C B) C/N C) N D) None of the above (note N represents Newton and C represents coulomb) 10. When the south poles of two bar magnets are brought close together, there will be? A) Downward force on both the magnets B) Both magnets will repel each other C) No force D) None of the above

          6. Which of the following is true about electric field lines.
a) Electric field line intersect each other
b) Electric field lines are directed away (outwards) from the negative charge
c) Electric field lines are directed towards the positive charge
d) None of the above

7. An electron is travelling at 3.20 !! 10? m/s perpendicular to an external magnetic field of magnitude 2.20 !! 10?¹T. Determine the magnitude of magnetic force acting on the electron.
A. 1.90 !! 10?¹ N
B. 1.00 !! 10?¹ N
C. 3.12 !! 10?¹ N
D. None of the above

8. Two parallel wires carrying current in same direction will
a) Do not affect each other
b) Be repelled first and then attract each other
c) Attract each other
d) None of the above
e) Incomplete statement thus result cannot be found

9. Units of electric potential energy are
A) N/C
B) C/N
C) N
D) None of the above (note N represents Newton and C represents coulomb)

10. When the south poles of two bar magnets are brought close together, there will be?
A) Downward force on both the magnets
B) Both magnets will repel each other
C) No force
D) None of the above

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6. Which of the following is true about electric field lines.
a) Electric field line intersect each other
b) Electric field lines are directed away (outwards) from the negative charge
c) Electric field lines are directed towards the positive charge
d) None of the above

7. An electron is travelling at 3.20 !! 10? m/s perpendicular to an external magnetic field of magnitude 2.20 !! 10?¹T. Determine the magnitude of magnetic force acting on the electron.
A. 1.90 !! 10?¹ N
B. 1.00 !! 10?¹ N
C. 3.12 !! 10?¹ N
D. None of the above

8. Two parallel wires carrying current in same direction will
a) Do not affect each other
b) Be repelled first and then attract each other
c) Attract each other
d) None of the above
e) Incomplete statement thus result cannot be found

9. Units of electric potential energy are
A) N/C
B) C/N
C) N
D) None of the above (note N represents Newton and C represents coulomb)

10. When the south poles of two bar magnets are brought close together, there will be?
A) Downward force on both the magnets
B) Both magnets will repel each other
C) No force
D) None of the above

Added by Erika A.

University Physics with Modern Physics

Hugh D. Young 14th Edition

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Solved by Expert Maitreya E

06/13/2022

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Step 1: Electric field lines never intersect each other. Show more…

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Which of the following is true about electric field lines. a) Electric field line intersect each other b) Electric field lines are directed away (outwards) from the negative charge c) Electric field lines are directed towards the positive charge d) None of the above 7. An electron is travelling at 3.20 !! 10⁵ m/s perpendicular to an external magnetic field of magnitude 2.20 !! 10⁻¹ T. Determine the magnitude of magnetic force acting on the electron. A. 1.90 !! 10⁻¹ N B. 1.00 !! 10⁻¹ N C. 3.12 !! 10⁻¹ N D. None of the above 8. Two parallel wires carrying current in same direction will a) Do not affect each other b) Be repelled first and then attract each other c) Attract each other d) None of the above e) Incomplete statement thus result cannot be found 9. Units of electric potential energy are A) N/C B) C/N C) N D) None of the above (note N represents Newton and C represents coulomb) 10. When the south poles of two bar magnets are brought close together, there will be? A) Downward force on both the magnets B) Both magnets will repel each other C) No force D) None of the above

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Transcript

00:01 Hello everyone.

00:03 So in this question there are total five questions okay so the first question is given as which of the following is true about the electric field line okay so now the first option is given as electric field line intersect each other now we know that electric field lines never never intersect each other okay so they are always parallel to each other.

00:33 So the first option is false.

00:35 Second option is given as electric field line are directed away from the negative charge.

00:42 Now we know that if this is the positive charge, okay, and this is the negative charge.

00:52 So from negative, from positive charge, the electric field lines are directed away and they goes to the negative charge okay so over here it is given that electric field lines are directed away that is outward from the negative charge but the electric field lines are inward for the negative charge and they are outward for the positive charge okay so for the sixth question the correct option is none of the above is true okay.

01:37 So this is the answer.

01:39 Now in the seventh question we have been given the following data that an electron is traveling at a speed of 3 .2 multiplied by 10 to the power 5 meter per second.

01:54 And the magnetic field is 2 .2 multiplied by 10 to the power minus 1 tesla and the electron enters the magnetic field at an angle of 90 degree.

02:04 Okay.

02:05 So now we have to find.

02:07 The magnitude of force acting on the electron so the formula is given as force is equals to q b v sine theta okay now here q is 1 .6 multiplied by 10 to the power minus 19 b is 2 .2 multiplied by 10 to the power minus 1 and velocity as 3 .2 multiplied by 10 to the power minus 1 and velocity as 3 .2 multiplied by 10 to the power 5 and sign 90 is 1 okay let us keep it 1 so we got the force as 11 .26 multiplied by 10 to the power minus 15 newton now you can see that this option is not present in any of the given options so this answer is not present in option hence the correct answer is none of the above.

03:17 Okay? now in the eighth question it is given that two parallel wire carrying current in the same direction will.

03:32 So if there are two current carrying wires, okay, they are in the same direction, then by using the right hand thumb rule we can find the direction of the magnetic field...

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