Following figures show the arrangement of bar magnets in different configurations. Each magnet has magnetic dipole moment $$\overrightarrow m .$$ Which configuration has highest net magnetic dipole moment ?
A
(1)
B
(2)
C
(3)
D
(4)
2
AIPMT 2014
MCQ (Single Correct Answer)
+4
-1
A thin semicircular conducting ring (PQR) of radius r is falling with its plane vertical in a horizontal magnetic field B, as shown in the figure.
The potential difference developed across the ring when its speed is $$v$$, is
A
zero
B
$${{Bv\pi {r^2}} \over 2}$$ and P is at higher potential
C
$$\pi rBV$$ and R is at higher potential
D
2rBV and R is at higher potential
3
AIPMT 2014
MCQ (Single Correct Answer)
+4
-1
A transformer having efficiency of 90% is working on 200 V and 3 kW power supply. If the current in the secondary coil is 6 A, the voltage across the secondary coil and the current in the primary coil respectively are
A
300 V, 15 A
B
450 V, 15 A
C
450 V, 13.5 A
D
600 V, 15 A
4
AIPMT 2014
MCQ (Single Correct Answer)
+4
-1
In a region, the potential is represented by V(x, y, z) = 6x $$-$$ 8xy $$-$$ 8y + 6yz, where $$V$$ is in volts and x, y, z are in metres. The electric force experienced by a charge of 2 coulomb situated at point (1, 1, 1) is
