1
AIPMT 2008
+4
-1
A closed loop PQRS carrying a current is placed in a uniform magnetic field. If the magnetic forces on segments PS, SR and RQ are F1, F2 and F3 respectively and are in the plane of the paper and along the directions shown, the force on the segment QP is
A
$$\sqrt {{{\left( {{F_3} - {F_1}} \right)}^2} - F_2^2}$$
B
$${F_3} - {F_1} + {F_2}$$
C
$${F_3} - {F_1} - {F_2}$$
D
$$\sqrt {{{\left( {{F_3} - {F_1}} \right)}^2} + F_2^2}$$
2
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
$$5550\,\Omega$$
3
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
4
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 $$\Omega$$
EXAM MAP
Medical
NEET