Advertisements
Advertisements
Question
A dry cell can supply a charge of 800 C. If continuous current of 8.0 mA is drawn, calculate the time in which cells will discharge completely.
Advertisements
Solution
Charge = Q = 800 C
Electric current = I = 8.0 mA
I = 8 × 10-3 A
Time = t = ?
I = `"Q"/"t"`
t = `"Q"/"I"`
t = `800/(8 xx 10^-3) = 100 xx 10^3`
t = 100000 s
APPEARS IN
RELATED QUESTIONS
The shape of the earth's magnetic field resembles that of an imaginary:
(a) U-shaped magnet
(b) Straight conductor carrying current
(c) Current-carrying circular coil
(d) Bar magnet
Figure. shows a bar magnet placed on the table top with its north pole pointing towards south. The arrow shows the north-south direction. There are no other magnets or magnetic materials nearby.
Insert two magnetic field lines on either side of the magnet using arrow head to show the direction of each field line.
How do you account for the following fact?
Soft iron keepers help to prevent the magnets from losing their magnetic properties.
Draw diagram showing the arrangement of the lines of force for two magnets in line, with unlike poles facing one another.
State any two properties of a magnet.
Complete the following diagram of magnets to show the lines of force.
______ is the number of magnetic field lines passing through a given area.
A charge moving in a magnetic field, in a direction other than the direction of the magnetic field, experiences a force. It is called the ______ force.
Assertion (A): Magnetic field lines never intersect each other.
Reason (R): If they intersect, then at the point of intersection, the compass needle would point towards two directions, which is not possible.
