1
AIPMT 2008
+4
-1
A galvanometer of resistance 50 $$\Omega$$ is connected to a battery of 3 V along with a resistance of 2950 $$\Omega$$ in series. A full scale deflection of 30 divisions is obtained in the galvanometer. In order to reduce this deflection to 20 divisions, the resistance in series should be
A
$$6050$$ $$\Omega$$
B
$$4450\,\Omega$$
C
$$5050\,\Omega$$
D
$$5550\,\Omega$$
2
AIPMT 2007
+4
-1
Under the influence of a uniform magnetic field, a charged particle moves with constant speed v in a circle of radius R. The time period of rotation of the particle
A
depends on R and not on v
B
is independent of both v and R
C
depends on both v and R
D
depends on v and not on R
3
AIPMT 2007
+4
-1
The resistance of an ammeter is 13 $$\Omega$$ and its scale is graduated for a current upto 100 amps. After an additional shunt has been connected to this ammeter it becomes possible to measure currents upto 750 amperes by this meter. The value of shunt-resistance is
A
2 $$\Omega$$
B
0.2 $$\Omega$$
C
2 k$$\Omega$$
D
20 $$\Omega$$
4
AIPMT 2006
+4
-1
Two circular coils 1 and 2 are made from the same wire but the radius of the 1st coil is twice that of the 2nd coil. What is the ratio of potential difference in volts should be applied across them so that the magnetic field at their centres is the same?
A
2
B
3
C
4
D
6
EXAM MAP
Medical
NEET