Physics Past Questions and Answers

Which of the following features of an electrostatic line of force is not correct?

A It is an imaginary line which a positive charge will describe if it is free to move
B The tangent drawn at any point on a curved line of force shows the direction of the electric field intensity at that point
C It is sometimes curved
D It can cross another line of force in a region of intense electric field

Question 3112:

Which of the following statement about force is correct ?

A Electrostatic, gravitational and magnetic forces are always attractive
B Electric, gravitational and magnetic field obeys inverse square law
C Field lines are real but their corresponding field are imaginary
D Field lines and their corresponding fields are both real

Question 3113:

A positively charged glass rod is placed by near the cap of a positively charge electroscope. The divergence of the leaf is observed to

A Decrease
B Increase
C Remain the same
D Increase and collapse immediately

Question 3114:

Two identical cells each of e.m.f 2v and internal resistance 1.0\(\Omega\) are connected in parallel. The combination is connected to an external load of 1.5\(\Omega\). Calculate the current in the circuit

A 0.57A
B 1.00A
C 1.14A
D 2.00A

Question 3115:

Which of the following factors does not affect the the electric resistance of a wire?

A Length
B Mass
C Temperature
D Cross sectional area