Quiz for Electric field and potential

Q1: The SI unit of electric field is:

A. N/C B. J/C C. V/m D. N·m

Q2: What is the direction of the electric field?

A. Towards negative charge B. Towards positive charge C. Perpendicular to the surface D. Along equipotential surface

Q3: The electric potential at a point is defined as:

A. Work done per unit charge B. Force per unit charge C. Energy per unit distance D. Work done per unit mass

Q4: Equipotential surfaces are always:

A. Parallel to electric field B. Perpendicular to electric field C. Concentric circles D. Radial lines

Q5: In a uniform electric field, the potential difference between two points is:

A. Zero B. Equal to the product of field and distance C. Infinity D. Negative

Q6: Work done in moving a charge on an equipotential surface is:

A. Maximum B. Zero C. Minimum D. Infinite

Q7: The electric potential due to a point charge varies as:

A. 1/r² B. r C. r² D. 1/r

Q8: The electric field due to a point charge is directed:

A. Away from negative charge B. Towards positive charge C. Away from positive charge D. Along equipotential lines

Q9: A positively charged particle is placed in an electric field. It moves:

A. From low to high potential B. Randomly C. From high to low potential D. In circular path

Q10: If the potential difference is 12V and the distance is 4 cm, the electric field is:

A. 3 N/C B. 48 N/C C. 300 N/C D. 600 N/C

Q11: The potential at a point due to an electric dipole at axial position varies as:

A. 1/r B. 1/r² C. 1/r³ D. r

Q12: If a point is at the same potential as another, the electric field between them is:

A. Maximum B. Negative C. Zero D. Infinity

Q13: Potential energy of a system of two opposite charges decreases when:

A. They are brought closer B. They are separated C. They are stationary D. They are rotated

Q14: Which of the following quantities is scalar?

A. Electric field B. Electric flux C. Electric potential D. Force

Q15: A unit positive charge is placed in a field. It experiences maximum force where:

A. Potential is maximum B. Field is maximum C. Potential is zero D. Charge is zero

Q16: Which law defines the relationship between electric field and electric potential?

A. Ohm’s law B. Faraday’s law C. Gauss’s law D. E = -dV/dr

Q17: A charge is moved in electric field. The potential energy:

A. Increases always B. Decreases always C. May increase or decrease D. Remains constant

Q18: The work done in moving 1 C charge through 5 V is:

A. 5 J B. 0.2 J C. 1 J D. 10 J

Q19: A charged particle is released in a uniform electric field. Its motion is:

A. Uniform B. Accelerated C. Circular D. Random