Electric Forces & Fields Test

Result

Electric Forces & Fields Test - 3

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Question 1
1 / -0

An electric dipole is placed in an electric field whose direction is fixed but whose magnitude varies with distance. The incorrect option is

A
it experiences a net force and no torque

B
it experiences a net force and a torque

C
it experiences no net force and no torque

D
it experiences no net force and a torque

Solution

Net torque on the dipole can be zero only if the dipole is aligned with the field. But in a non-uniform field, when the dipole is aligned with the field, then force on the ends of dipole will be different. Thus net force on the dipole cannot be zero, if torque on the dipole is zero.

Net force on the dipole can be zero only if dipole is perpendicular to the field and the direction of field is same everywhere. But in such an orientation, torque on the dipole cannot be zero.

Thus, it is not possible to have a situation where both torque and force on the dipole are simultaneously zero in a non-uniform field

The correct answer is: it experiences no net force and no torque
Question 2
1 / -0

Force on an electron located on the 0 - volt potential line (in previous problem) is

A
directed to the left, but its magnitude cannot be determined without knowing the distance between the lines

B
zero

C
2N, directed to the right

D
directed to the right, but its magnitude cannot be determined without knowing the distance between the lines

Solution

Electric field is perpendicular to equipotential surfaces and directed from high to low potential. So field will be directed towards left.

Thus force on an electron will be directed towards right but its magnitude cannot be determined as E is unknown.

The correct answer is: directed to the right, but its magnitude cannot be determined without knowing the distance between the lines