JEE Physics · 160 questions. Try each one, then check the answer and solution.
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Q21.AI-generated practiceSingle-correct MCQEasy
The magnitude of the electric field at a distance of 30 cm from a point charge of 5 μC in air is (1/(4πε0) = 9 × 109 N m2 C-2):
Q22.AI-generated practiceSingle-correct MCQEasy
Which statement about electrostatic field lines is NOT correct?
Q23.AI-generated practiceSingle-correct MCQMedium
Charges +q are placed at three corners of a square of side a and a charge −q at the fourth corner. The magnitude of the electric field at the centre of the square is (k = 1/4πε0):
Q24.AI-generated practiceSingle-correct MCQMedium
An electron is placed in a uniform electric field of 2 × 104 N/C. The magnitude of its acceleration is (e = 1.6 × 10-19 C, me = 9.1 × 10-31 kg):
Q25.AI-generated practiceSingle-correct MCQMedium
Charges +16 μC and +4 μC are fixed 60 cm apart. The electric field is zero at a point on the line joining them, located:
Q26.AI-generated practiceSingle-correct MCQHard
A thin ring of radius R carries a uniformly distributed charge Q. The electric field on its axis is maximum at a distance x from the centre equal to:
Q27.AI-generated practiceSingle-correct MCQMedium
The electric field due to a long straight uniformly charged wire is 9 × 104 N/C at a distance of 2 cm from it. The field at a distance of 6 cm is:
Q28.AI-generated practiceSingle-correct MCQEasy
Which of the following is an SI unit of electric field equivalent to N/C?
Q29.AI-generated practiceSingle-correct MCQHard
A small ball of mass 2 g carrying a charge of 5 μC hangs from an insulating thread in a uniform horizontal electric field. In equilibrium the thread makes 45° with the vertical. The magnitude of the field is (g = 10 m/s2):
Q30.AI-generated practiceSingle-correct MCQMedium
An electron moving horizontally enters a region of uniform vertical electric field. Its path inside the field region is:
Q31.AI-generated practiceSingle-correct MCQHard
A proton is released from rest in a uniform electric field of 1 × 104 N/C. Its speed after moving 1 cm along the field is about (e = 1.6 × 10-19 C, mp = 1.67 × 10-27 kg):
Q32.AI-generated practiceSingle-correct MCQMedium
A ring of radius 3 cm carries a charge of 5 nC distributed uniformly. The electric field on its axis at 4 cm from the centre is (1/(4πε0) = 9 × 109 N m2 C-2):
Q33.AI-generated practiceSingle-correct MCQEasy
How does the electric field of a very large uniformly charged plane sheet depend on the distance r from it (for points not too far away)?
Q34.AI-generated practiceSingle-correct MCQHard
Two large parallel plane sheets carry equal uniform surface charge densities +σ each. The electric field is:
Q35.AI-generated practiceNumerical valueEasy
A charge of 2 μC is placed in a uniform electric field of 3 × 105 N/C. If the force on it is x × 10-1 N, find x.
Q36.AI-generated practiceNumerical valueMedium
Charges +5 μC and −5 μC are 20 cm apart. Take 1/(4πε0) = 9 × 109 N m2 C-2. If the magnitude of the electric field at the midpoint is x × 106 N/C, find x.
Q37.AI-generated practiceNumerical valueMedium
An electron moving with speed 1.6 × 106 m/s enters a uniform electric field of 91 N/C directed along its velocity. Find the distance (in cm) it travels before coming momentarily to rest. (e = 1.6 × 10-19 C, me = 9.1 × 10-31 kg)
Q38.AI-generated practiceNumerical valueHard
A long straight wire carries a uniform linear charge density of 2 μC/m. Take 1/(4πε0) = 9 × 109 N m2 C-2. If the electric field at a perpendicular distance of 12 cm from it is x × 105 N/C, find x.
Q39.AI-generated practiceAssertion–ReasonEasy
Assertion (A): Two electric field lines never cross each other. Reason (R): Electric field lines start on positive charges and end on negative charges.
Q40.AI-generated practiceAssertion–ReasonMedium
Assertion (A): A charged particle released from rest in an electrostatic field always moves along a field line. Reason (R): The force on a charge is along the tangent to the field line at its position.