1.Why do we use a very small charge in order to define electric field? a. Actual

Question

1.Why do we use a very small charge in order to define electric field?

a. Actually, we need to use a big charge to define the electric field.

b. Because charges are very, very small.

c. So that charge doesn't affect the electric field we're defining.

2. What does Doc Physics use the direction of force on a SmPTC for?

a. To define the direction of the electric field.

b. To define the direction of the magnetic field.

c. To demonstrate Newton's 3rd Law.

d. To demonstrate Coulomb's Law.

3. Where to electric field lines end?

a. They do not ever end.

b. At neutral charges.

c. At negative charges or at infinity.

d. At positive charges or at infinity.

Explanation / Answer

1. Ans :C.Ideally Electric filed = F/q where q is the test charge not the source charge. Since the test charge cannot exert force on itself , whatever the value of test charge the force and hence E is same . Ideally the ussage of test charge does not affect the charge istribution of the sources.A small charge will ensure that the electric field it produces doesnot redistribute inany other conductors of the system.Also large test charge will polarize nearby surfaces and masuremnet of E will be wrong

2Ans a:

Direction of electric force will gives the direction of electric field on unit positive test charge.

3 Ans C:

Electric field lines starts and ends at charges. It starts at positive charges and ends at negative charges or infinity

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