3.6 x 103J
5.0 x 103J
3.0 x 105J
1.8 x 107J
Correct answer is D
Elect. energy = I2Rt
= 100 x 100 x 0.5 x 3600
= 1.8 x 107J
The iron core of an induction coil is made from bundles of wire so as to
minimize eddy-currents
generate eddy-current
prevent sparking at the contact breaker
get the greatest posible secondary voltage
Correct answer is A
No explanation has been provided for this answer.
What is the capacitance? [εo = 9.0 X 10-−12C2N-1m-2]
2.25 x 10-17F
4.50 x 10-17F
2.25 x 10-16F
4.50 x 10-16F
Correct answer is A
C = εoAd
= 5×10−8×10−12×92×10−3
= 22.5 x 10-17F
Which of the following can be used to reduce local action in a Laclanche cell?
A carbon rod as the positive pole
Pure zinc as the negative pole
Potassium permanganate solution in contact with the positive pole
common salt solution
Correct answer is C
No explanation has been provided for this answer.