HARD
12th ICSE
IMPORTANT
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Electric charges ±1000 μC are placed at points A and B, respectively at a distance of 2 m from each other. Calculate the electric fields at (i) mid-point of the line AB

Important Questions on Electric Charges and Fields

HARD
12th ICSE
IMPORTANT
Electric charges ±1000 μC are placed at points A and B, respectively at a distance of 2 m from each other. Calculate the electric field at a point at equal distance of 4 m from each charge.
MEDIUM
12th ICSE
IMPORTANT
A stationary oil drop between two parallel plates has a charge of 3.2×10-19 C and a weight of 1.6 ×10-14N. Find the electric field acting on the drop.
MEDIUM
12th ICSE
IMPORTANT
Two charges, one +5 μC and other -5 μC are placed 1 mm apart. Calculate the dipole moment.
MEDIUM
12th ICSE
IMPORTANT
A system has two charges qA=+0.25 μC and qB=-0.25 μC at points A (0, 0, -15 cm) and B (0, 0, +15 cm), respectively. Find the total charge and electric dipole moment of the system.
HARD
12th ICSE
IMPORTANT
Two charges of +2.4 μC and -2.4 μC are at a distance 2.5×10-3 m apart from each other. Determine the magnitude of the electric field in the broad-side-on position at a distance of  0.30 m from this dipole. If the dipole be rotated through 90, then what will be the intensity of the field?
MEDIUM
12th ICSE
IMPORTANT
Two point-charges of +1 μC and -1 μCare kept at a distance of 2 cm. They form an electric dipole. This dipole is situated in a uniform electric; field of 1×105 NC-1, with dipole moment vector p making an angle of 30 with the field. Calculate (i) the magnitude of electric dipole moment. 
MEDIUM
12th ICSE
IMPORTANT
Two point-charges of +1 μC and -1 μCare kept at a distance of 2 cm. They form an electric dipole. This dipole is situated in a uniform electric field of 1×105 NC-1, with dipole moment vector p making an angle of 30 with the field. Calculate, (ii) the torque acting on the dipole. 
MEDIUM
12th ICSE
IMPORTANT
Two point-charges of +1 μCand -1 μC are kept at a distance of 2 cm. They form an electric dipole. This dipole is situated in a uniform electric; field of 1×105 NC-1, with dipole moment vector p making an angle of 30 with the field. Calculate (iii) When would be the torque maximum? How much?