Which of the following factors does not affect the the electric resistance of a wire?
length
mass
temperature
cross sectional area
Correct answer is B
No explanation has been provided for this answer.
0.57A
1.00A
1.14A
2.00A
Correct answer is B
I = \(\frac{E}{R + r} = \frac{2}{1.5 + 0.5}\)
= 1A
decrease
increase
remain the same
increase and collapse immediately
Correct answer is B
No explanation has been provided for this answer.
Which of the following statement about force is correct ?
electrostatic, gravitational and magnetic forces are always attractive
electric, gravitational and magnetic field obeys inverse square law
fields are real but their corresponding field lines are imaginary
field lines and their corresponding fields are both real
Correct answer is C
No explanation has been provided for this answer.
Which of the following features of an electrostatic line of force is not correct?
it is an imaginary line which a positive charge will describe if it is free to move
the tangent drawn at any point on a curved line of force shows the direction of the electric field intensity at that point
it is sometimes curved
it can cross another line of force in a region of intense electric field
Correct answer is D
No explanation has been provided for this answer.