Physics Darpan Class 12. We covered all the Physics Darpan Class 12 in this post for free so that you can practice well for the exam.
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Physics Darpan Class 12 Mock Test for Students
Suppose that an earth of radius 6400 km has a net charge equivalent to one electron per square meter of its surface area. Its potential in volt will be :
(A) -1.2
(B) -0.12
(C) 1.2
(D) 0.12
Option b – -0.12
Two identical rings P and Q of radius 0.1 m are mounted co-axially at a distance of 0.5 m apart. charges on the two rings are 2μC and 4μC respectively. The work done in transferring a 5uC from the center of P to that of Qis: charge of
(A) 2 J
(B) 1.44 J
(C) 1.28 J
(D) 0.72 J
Option d – 0.72 J
Point charges of 3 nC are situated at each of the three corners of a square whose side is 15 cm. The electric potential at the vacant corner of the square is :
(A) Zero
(B) 272 V
(C) 487.3 V
(D) 888.5 V
Option c – 487.3 V
Two electric charges of 9uC and -3μC are placed 16 cm apart in the air. There are two points A and B on the line joining the two charges at distances i) 4 cm from -3μC and in between the charges and ii) 8 cm from -3μC and outside the charge -3μC on the same line. The potentials at A and B are :
(A) 0V, 0V
(B) 0V, 10V
(C) 10V, 0V
(D) 10V, 15V
Option a – 0V, 0V
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