Chapter : 01 Electric charges and fields

Question: Consider three charges q1, q2, q3 each equal to q at the vertices of an equilateral triangle of side l. What is the force on a charge Q (with the same sign as q) placed at the centroid of the triangle? (NCERT)

Continue ReadingQuestion: Consider three charges q1, q2, q3 each equal to q at the vertices of an equilateral triangle of side l. What is the force on a charge Q (with the same sign as q) placed at the centroid of the triangle? (NCERT)

Question: An electron moves a distance of 6 cm when accelerated from rest by an electric field of strength 2 x 10^-4 N/C. Calculate the time of travel. The mass and charge of electron are 9 x 10^-31 kg and 1.6 x 10^-19 C respectively.

Continue ReadingQuestion: An electron moves a distance of 6 cm when accelerated from rest by an electric field of strength 2 x 10^-4 N/C. Calculate the time of travel. The mass and charge of electron are 9 x 10^-31 kg and 1.6 x 10^-19 C respectively.

Question: A metallic spherical shell has a inner radius R1 and outer radius R2. A charge Q is placed at the centre of the spherical cavity. What will be surface charge density on (i) the inner surface and (ii) the outer surface? [NCERT Exemplar]

Continue ReadingQuestion: A metallic spherical shell has a inner radius R1 and outer radius R2. A charge Q is placed at the centre of the spherical cavity. What will be surface charge density on (i) the inner surface and (ii) the outer surface? [NCERT Exemplar]

Question: A free pith-ball A of 8g carries a positive charge of 5 x 10^-8 C. What must be the nature and magnitude of charge that should be given to a second pith-ball B fixed 5 cm below the former ball so that the upper ball is stationary?

Continue ReadingQuestion: A free pith-ball A of 8g carries a positive charge of 5 x 10^-8 C. What must be the nature and magnitude of charge that should be given to a second pith-ball B fixed 5 cm below the former ball so that the upper ball is stationary?