YASH CLASSES
CURRENT AND RESISTANCE
1. Fill in blanks –
1.
Relationship between the
current and
drift velocity.................
2. Current
density J
=...........=........=......
4.
Specific conductivity σ
=........=........=
5.a.unit of current I=...
b. Current density
J =...
c. Specific conductivity σ
=....
d. resistance
R=...
e. resistivity ρ=....
6.Define
mobility of charge ?
7. At room temperature the relaxation time of free electron in copper wire is
2.5x10-14 sec. Calculate mobility of electron.
8. explain combination of cell 1. series and 2. parallel
MOVING CHARGE AND
MAGNETISM
1. Define bio-savart law ?
2. Explain magnetic field due to a straight current carrying wire ?
3. A circular coil of copper wire has 100 turns and its mean diameter is 30 cm .
If 5 A current flows through the coil then calculate the intensity of magnetic field
and its direction at 1. the center of coil 2. at the distance 25 cm from on the axis of coil .
MAGNETISM AND
MATTER
1. Define work done
in rotating a magnetic ?
2. Define the term 1. angle of declination 2. angle of dip
3. horizontal component of earth’s magnetic field ?