Assertion and reason: fields

Exercise and reference answers

Questions

1. Reason

   A large test charge would disturb the very configuration being measured.

   Verdict

   Both are true; the reason explains the assertion.

   Assertion

   A small test charge is used to define the field.

2. Reason

   Their crowding encodes the varying strength of the field.

   Verdict

   Both are true; the reason explains the assertion.

   Assertion

   Field lines never carry equal spacing everywhere around a point charge.

3. Reason

   Field lines indicate direction by their tangent.

   Verdict

   Both are true; the reason does not explain the assertion.

   Assertion

   The SI unit of charge is the coulomb.

Explanation